NEED HELP WITH WIFE S10 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**THECRAZYKIDJR** · 05-09-2002, 09:13 PM

I KNOW ITSTHE WRONG BOARD, BUT I'M HOPING SOMEONE ON HERE CAN TELL ME THE PROBLEM....

93 S10 BLAZER 4.3 5SPD 4WD 111,000 MILES

WAS ACTING LIKE IT WAS CROSS FIRING ONLY WHEN RAINING OR DAMP OUT, THEN JUST ALSO WHEN IT SAT AND WAS COLD AT STARTUP...IT WOULD RUN NORMAL AFTER IT GOT UP TO TEMP

DID A FULL TUNE UP, PLUGS, WIRES, CAP, ROTOR, AIR & FUEL FILTER

NO CHANGE...NOTICED THE CAT WAS CHERRY RED AFTER I GOT IT TO TEMP...GONNA CHANGE THAT

ALSO NOTICED THAT IT SOUNDS LIKE ITS NOT SPRAYING FUEL RIGHT...KINDA SKIPS

OXYGEN SENSOR? MAP SENSOR? EGR? AIR INTAKE SENSOR?

BY THE WAY ....NOT FLASHING ANY CODES!!!!

HELP ME!!! MY WIFE IS DRIVING MY TRUCK UNTIL ITS FIXED, I WANT MY TRUCK BACK!!!!!!!

------------------
JIM PARKER
THECRAZYKIDJR
GLENBURN, MAINE

REMEMBERING DALE EARNHARDT 1951 - 2001...RIP

1999 DODGE DAKOTA SPORT 4X4 (31" BFG ALL-TERR KO'S)

1969 K5 BLAZER (ORANGE / 35" SUPER SWAMPERS)

1970 CUSTOM-10 LONG BED FLEET/350/4SPD/PS/PB/AIR/TILT/TACH/VAC/AM-FM/SPEED MINDER/WOOD FLOOR BED/SLIDER/CARGO LIGHT/BUCKETS&CONSOLE/TINTED GLASS/HEADLINER/AUX. REAR SPRINGS/TOOL STOWAGE BOX
(STILL AT THE RESTO SHOP, GETTING PAINTED)

chevy2racr · 05-09-2002, 09:19 PM

my guess would be partly EGR but check engine shouldcome n from it, m bro has a 93 tahoe blazer with 4.3 vortec, and ti sounded like sh*t, we pulled it off, and it was really built up with carbon, and was stickin, cleaned it up, started it once with out it on, blew some carbonoutta the motor, then put it backon, ran way better.. hope I helped,
Bryce

*Randy70C-10* · 05-09-2002, 09:21 PM

Uhhhh, the cat turning cherry red could be the problem. You exhaust is stopped up!

cableguy0 · 05-09-2002, 09:22 PM

does it have a check engine light on. run some fuel injector cleaner through it first i would use the chevron techron b/c it is the best sh!t on the market. need to know if there is a check engine light or not

------------------
72 chevy lwb 350 lunati cam ported and polished cast 2.02 heads proform hei edelbrock performer rpm and 750 carb balanced bottom end 9.5:1 compression ps,pb th350 with a tci 2500 stall convertor full man v-body kevlar clutches and bands as well as other goodies

Don Smith · 05-09-2002, 09:25 PM

Definitely an electrical problem. Dist cap may have a hairline crack and moisture causing it to arc between terminals or to ground, also could be wires arcing. Get in total darkness and look at engine while it is running, you may be able to see arc or hear it.

*Randy70C-10* · 05-09-2002, 09:26 PM

He changed the cap.

**THECRAZYKIDJR** · 05-09-2002, 09:48 PM

DID A FULL TUNE UP

NO CHECK ENGINE LIGHT, NO CODES, ALREADY TRIED INJ CLEANER

RANDY, I'M GONNA CHANGE THE CAT, BUT WHY WOULD THE CAT ONLY GIVE THE PROBLEM WHEN COLD, INTERMITEDLY??? WOULDN'T IT DO IT ALL THE TIME?

------------------
JIM PARKER
THECRAZYKIDJR
GLENBURN, MAINE

REMEMBERING DALE EARNHARDT 1951 - 2001...RIP

1999 DODGE DAKOTA SPORT 4X4 (31" BFG ALL-TERR KO'S)

1969 K5 BLAZER (ORANGE / 35" SUPER SWAMPERS)

1970 CUSTOM-10 LONG BED FLEET/350/4SPD/PS/PB/AIR/TILT/TACH/VAC/AM-FM/SPEED MINDER/WOOD FLOOR BED/SLIDER/CARGO LIGHT/BUCKETS&CONSOLE/TINTED GLASS/HEADLINER/AUX. REAR SPRINGS/TOOL STOWAGE BOX
(STILL AT THE RESTO SHOP, GETTING PAINTED)

*Randy70C-10* · 05-09-2002, 09:54 PM

Hmmm, good question. Start the truck, and put your hand over the exhaust pipe to see if the exhaust is getting good flow. If it's not, then your cat is clogged. I don't know why it would only run bad intermitently though. One thing you could try before spending money is to remove the cat, drive a hole through it with a pipe, and stick it back on. Fire it up and see if it runs any better, if not , at least you didn't lose anything.

ebfabman · 05-09-2002, 10:18 PM

A quick check for the exhaust flow is to drill a 3/8 or so hole in front of and behind the cat. If there is a huge pressure difference between the two, the cat is clogging.....

Longhorn Man · 05-09-2002, 11:16 PM

I am having very similar problems with our 29 S-10 POS blazer. Which 4.3 do you have, the W or the Z? (W is the vortec)
The EGR will seldom set off the check engine light on the Vortec. It is a very crappy design, you can clean it, replace it, but it'll get clogged up real quick with more carbon.
If it is/was running rich, like when it is not fireing on all 6, the verter will get clogged. It also seems more sensitiv than any other catilitic converter i have ever seen.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough?
Columbus Ohio

70shortnphat · 05-10-2002, 12:08 AM

I beleive this engine is equipt with (ESC)and it can malfunction and not send a code.
The ECM controls timing through the ESC module , knock sensor, and refrence signal from dist. There may be a problem somewhere in this system that is causing the ECM to retard the timing (up to 20 degres) and that is causing a rich condition and heating up the cat. I feel that the chery red cat is the result of another problem and not the problem itself. It will be a problem if It keeps getting red hot and fuel soaked.Good luck with this and please let us know what the problem was when you fix this so we can all benefit.

------------------
1970 short bed fleetside

ddsmith · 05-10-2002, 12:23 AM

I don't understand why the Check engine light is not on if the condition we are discussing involves a rich mixture. The O2 sensor should pick this up and set the code. I guess this computer stuff is great when it works. I had a MAF go bad on me and no code was set. The car stalled anytime you let RPM go below 2000 RPM. Once I unplugged it the car ran closer to normal. I think it had to do with the problem had to stay in long enough to set the code.

------------------
66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
79 Chevy 4X4 (Tom's old truck)

b68gmc · 05-10-2002, 07:08 AM

http://www.s-series.com/

Try you post here...

texnician01 · 05-10-2002, 09:50 AM

I had a problem with my 88 S-10 where it would fall on it's face and try to die when you pulled up to a stop. it would be totally intermittent, unpredictable. I never could figure out what it was. no codes. I finally put a microswitch and light on the egr valve and a light on the control selenoid. It turned out to be the selenoid was not sealing. it would let a vacuum signal get to the egr and would open it and cause a lean condition at idle. can't remember if the 4.3 has this conotrol selenoid but that may be a start. I realize that this problem doesn't explain all of the symptoms you have but it may be a start.

Nathan

------------------
1969 C-10 292 I-6 4 spd in the middle of a restoration. going to get a 327 and 3.07 gears but keeping all of the original parts so I can put it back to original later on down the road.
55 chevy 4 door 150
47 Willys CJ-2A

**John Fabris** · 05-10-2002, 10:25 AM

Hi,

I have a 93 GMC Jimmy with the 4.3 Vortex motor, and several years ago it starting running rough off and on, and my milages dropped drastically. Took it to several shops to have all of them tell me that they could find nothing wrong. Took it to a good shop and they found that the fuel injection system was faulty. Had that replaced, roughly around $1300.00. BUT, because I had registered myself with GMC as the new owner (2nd owner) of the Jimmy, two months after having the repair done, GMC sent me a recall notice on the fuel injection unit. I sent them the info that I had already had mine replaced and GMC reimbursed the repairs.

Might want to check into that....

------------------
John Fabris
john.fabris@autodesk.com
1967 C10 SWB FleetSide Web Page
1971 K5 Blazer 2WD (basket case, but give me two years or so.)

05-09-2002, 09:13 PM	#1
THECRAZYKIDJR Registered User Join Date: Jun 2000 Location: GLENBURN, MAINE, USA Posts: 262	NEED HELP WITH WIFE S10 I KNOW ITSTHE WRONG BOARD, BUT I'M HOPING SOMEONE ON HERE CAN TELL ME THE PROBLEM.... 93 S10 BLAZER 4.3 5SPD 4WD 111,000 MILES WAS ACTING LIKE IT WAS CROSS FIRING ONLY WHEN RAINING OR DAMP OUT, THEN JUST ALSO WHEN IT SAT AND WAS COLD AT STARTUP...IT WOULD RUN NORMAL AFTER IT GOT UP TO TEMP DID A FULL TUNE UP, PLUGS, WIRES, CAP, ROTOR, AIR & FUEL FILTER NO CHANGE...NOTICED THE CAT WAS CHERRY RED AFTER I GOT IT TO TEMP...GONNA CHANGE THAT ALSO NOTICED THAT IT SOUNDS LIKE ITS NOT SPRAYING FUEL RIGHT...KINDA SKIPS OXYGEN SENSOR? MAP SENSOR? EGR? AIR INTAKE SENSOR? BY THE WAY ....NOT FLASHING ANY CODES!!!! HELP ME!!! MY WIFE IS DRIVING MY TRUCK UNTIL ITS FIXED, I WANT MY TRUCK BACK!!!!!!! ------------------ JIM PARKER THECRAZYKIDJR GLENBURN, MAINE REMEMBERING DALE EARNHARDT 1951 - 2001...RIP 1999 DODGE DAKOTA SPORT 4X4 (31" BFG ALL-TERR KO'S) 1969 K5 BLAZER (ORANGE / 35" SUPER SWAMPERS) 1970 CUSTOM-10 LONG BED FLEET/350/4SPD/PS/PB/AIR/TILT/TACH/VAC/AM-FM/SPEED MINDER/WOOD FLOOR BED/SLIDER/CARGO LIGHT/BUCKETS&CONSOLE/TINTED GLASS/HEADLINER/AUX. REAR SPRINGS/TOOL STOWAGE BOX (STILL AT THE RESTO SHOP, GETTING PAINTED) __________________ JIM PARKER GLENBURN, MAINE 69 BURB 4WD - 307/4SPD/YELLOW 69 BLAZER (ORANGE / 35" SUPER SWAMPERS) 1970 CUSTOM-10

05-09-2002, 09:19 PM	#2
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	my guess would be partly EGR but check engine shouldcome n from it, m bro has a 93 tahoe blazer with 4.3 vortec, and ti sounded like sh*t, we pulled it off, and it was really built up with carbon, and was stickin, cleaned it up, started it once with out it on, blew some carbonoutta the motor, then put it backon, ran way better.. hope I helped, Bryce __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

05-09-2002, 09:22 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	does it have a check engine light on. run some fuel injector cleaner through it first i would use the chevron techron b/c it is the best sh!t on the market. need to know if there is a check engine light or not ------------------ 72 chevy lwb 350 lunati cam ported and polished cast 2.02 heads proform hei edelbrock performer rpm and 750 carb balanced bottom end 9.5:1 compression ps,pb th350 with a tci 2500 stall convertor full man v-body kevlar clutches and bands as well as other goodies __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

05-09-2002, 09:25 PM	#5
Don Smith Registered User Join Date: Jul 2000 Location: Hampton, Ga, USA Posts: 217	Definitely an electrical problem. Dist cap may have a hairline crack and moisture causing it to arc between terminals or to ground, also could be wires arcing. Get in total darkness and look at engine while it is running, you may be able to see arc or hear it. __________________ 68 Short Stepside, 350, quadrajet, 700r4, 3:73 posi, power front discs, HEI, Factory Air, Tilt, Tach, accelerator cable instead of rod, sway bar. 96 Impala SS 97 Monte Carlo

05-09-2002, 09:48 PM	#7
THECRAZYKIDJR Registered User Join Date: Jun 2000 Location: GLENBURN, MAINE, USA Posts: 262	DID A FULL TUNE UP NO CHECK ENGINE LIGHT, NO CODES, ALREADY TRIED INJ CLEANER RANDY, I'M GONNA CHANGE THE CAT, BUT WHY WOULD THE CAT ONLY GIVE THE PROBLEM WHEN COLD, INTERMITEDLY??? WOULDN'T IT DO IT ALL THE TIME? ------------------ JIM PARKER THECRAZYKIDJR GLENBURN, MAINE REMEMBERING DALE EARNHARDT 1951 - 2001...RIP 1999 DODGE DAKOTA SPORT 4X4 (31" BFG ALL-TERR KO'S) 1969 K5 BLAZER (ORANGE / 35" SUPER SWAMPERS) 1970 CUSTOM-10 LONG BED FLEET/350/4SPD/PS/PB/AIR/TILT/TACH/VAC/AM-FM/SPEED MINDER/WOOD FLOOR BED/SLIDER/CARGO LIGHT/BUCKETS&CONSOLE/TINTED GLASS/HEADLINER/AUX. REAR SPRINGS/TOOL STOWAGE BOX (STILL AT THE RESTO SHOP, GETTING PAINTED) __________________ JIM PARKER GLENBURN, MAINE 69 BURB 4WD - 307/4SPD/YELLOW 69 BLAZER (ORANGE / 35" SUPER SWAMPERS) 1970 CUSTOM-10

05-09-2002, 09:21 PM	#3
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Uhhhh, the cat turning cherry red could be the problem. You exhaust is stopped up!

05-09-2002, 09:26 PM	#6
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	He changed the cap.

05-09-2002, 09:54 PM	#8
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Hmmm, good question. Start the truck, and put your hand over the exhaust pipe to see if the exhaust is getting good flow. If it's not, then your cat is clogged. I don't know why it would only run bad intermitently though. One thing you could try before spending money is to remove the cat, drive a hole through it with a pipe, and stick it back on. Fire it up and see if it runs any better, if not , at least you didn't lose anything.

05-09-2002, 10:18 PM	#9
ebfabman Registered User Join Date: Nov 2001 Location: Concord, NC Posts: 2,488	A quick check for the exhaust flow is to drill a 3/8 or so hole in front of and behind the cat. If there is a huge pressure difference between the two, the cat is clogging.....

05-09-2002, 11:16 PM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I am having very similar problems with our 29 S-10 POS blazer. Which 4.3 do you have, the W or the Z? (W is the vortec) The EGR will seldom set off the check engine light on the Vortec. It is a very crappy design, you can clean it, replace it, but it'll get clogged up real quick with more carbon. If it is/was running rich, like when it is not fireing on all 6, the verter will get clogged. It also seems more sensitiv than any other catilitic converter i have ever seen. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough? Columbus Ohio

05-10-2002, 12:08 AM	#11
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	I beleive this engine is equipt with (ESC)and it can malfunction and not send a code. The ECM controls timing through the ESC module , knock sensor, and refrence signal from dist. There may be a problem somewhere in this system that is causing the ECM to retard the timing (up to 20 degres) and that is causing a rich condition and heating up the cat. I feel that the chery red cat is the result of another problem and not the problem itself. It will be a problem if It keeps getting red hot and fuel soaked.Good luck with this and please let us know what the problem was when you fix this so we can all benefit. ------------------ 1970 short bed fleetside __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

05-10-2002, 12:23 AM	#12
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	I don't understand why the Check engine light is not on if the condition we are discussing involves a rich mixture. The O2 sensor should pick this up and set the code. I guess this computer stuff is great when it works. I had a MAF go bad on me and no code was set. The car stalled anytime you let RPM go below 2000 RPM. Once I unplugged it the car ran closer to normal. I think it had to do with the problem had to stay in long enough to set the code. ------------------ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 79 Chevy 4X4 (Tom's old truck) __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

05-10-2002, 07:08 AM	#13
b68gmc Registered User Join Date: Sep 2000 Location: Dayton, Ohio Posts: 214	http://www.s-series.com/ Try you post here...

05-10-2002, 09:50 AM	#14
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	I had a problem with my 88 S-10 where it would fall on it's face and try to die when you pulled up to a stop. it would be totally intermittent, unpredictable. I never could figure out what it was. no codes. I finally put a microswitch and light on the egr valve and a light on the control selenoid. It turned out to be the selenoid was not sealing. it would let a vacuum signal get to the egr and would open it and cause a lean condition at idle. can't remember if the 4.3 has this conotrol selenoid but that may be a start. I realize that this problem doesn't explain all of the symptoms you have but it may be a start. Nathan ------------------ 1969 C-10 292 I-6 4 spd in the middle of a restoration. going to get a 327 and 3.07 gears but keeping all of the original parts so I can put it back to original later on down the road. 55 chevy 4 door 150 47 Willys CJ-2A __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

05-10-2002, 10:25 AM	#15
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Hi, I have a 93 GMC Jimmy with the 4.3 Vortex motor, and several years ago it starting running rough off and on, and my milages dropped drastically. Took it to several shops to have all of them tell me that they could find nothing wrong. Took it to a good shop and they found that the fuel injection system was faulty. Had that replaced, roughly around $1300.00. BUT, because I had registered myself with GMC as the new owner (2nd owner) of the Jimmy, two months after having the repair done, GMC sent me a recall notice on the fuel injection unit. I sent them the info that I had already had mine replaced and GMC reimbursed the repairs. Might want to check into that.... ------------------ John Fabris john.fabris@autodesk.com 1967 C10 SWB FleetSide Web Page 1971 K5 Blazer 2WD (basket case, but give me two years or so.) __________________ John Fabris 67 C10 SWB



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