ATTN: Need help quick - Check engine light - The 1947 - Present Chevrolet & GMC Truck Message Board Network

apstguy · 07-26-2003, 01:04 AM

I just finished installing my amp and subs and now my check engine light is on. What two pins to I short to get the codes? Where can I find the codes? I ran the power fro the sub through the firewall in the hole where all the computer stuff comes out of (uh ho). Thanks!!

apstguy · 07-26-2003, 01:18 AM

Come on guys! I need to know tonight! Truck drive perfectly fine but the light is on which scares me because that usually means something is horribly wrong because the computer is so brain-dead!

navybear70 · 07-26-2003, 01:26 AM

You have a check-engine light?!? That's pretty high-tech dude. I gotta check my engine manually!

Seriously, I don't know...sorry.

apstguy · 07-26-2003, 01:30 AM

I got the trouble code: 34 - A firebird site says it is the MAP or MAF sensor. WTF??? I don't have a MAP sensor or a MAF sensor! This thing is like a "Something is wrong" light. The trouble code really didn't help. Grrrr.....

apstguy · 07-26-2003, 02:02 AM

I have been messing with it and sometimes before I start it I get a loud fast continuous clicking (usually I get a soft slow clicking) It sounds like a normal noise that happens at about 1/4 throttle but now before I start it. It has a slower than normal idle but only barely. Since it is black outside (11pm) I can't really see anything.

Here is the sensor outlined in red:

What the hell is that sensor? A MAP sensor? I ran my hand down the vaccuum line and it is cut. Is that my problem?

apstguy · 07-26-2003, 10:59 AM

TTT

Jonboy · 07-26-2003, 11:33 AM

yes. repair or replace the vacuum line and the problem should go away. BTW, the MAP really does not have a lot of effect on the way your truck will drive, so it is not something to really worry about. The light is more of a nuisance on a carbed vehicle anyhow. The reason it is on is because the sensor is not getting a vacuum signal without the line attached. Make sure the plug is in tight, put vacuum to it, and it will be fine.

apstguy · 07-26-2003, 02:17 PM

Thanks!

apstguy · 07-28-2003, 12:36 AM

That night it was dark and I was tired and hot. I looked at it today and found that the line was just un-plugged! Problem solved! I did however find out they don't make that hard plastic emissions vaccuum tubing anymore. Not the Chevy dealer, Kragen, or Autozone has it. Kragen used to 6 months ago. Maybe I get one of those special emissions exempt things because my hoses are all split? (I don't know HOW that would happen...)

TIMSPEED · 07-28-2003, 01:41 AM

How do the subs sound??

apstguy · 07-28-2003, 01:48 PM

Subs are great! I have to fine tune the amp though, it can get a little boomy at times. I have the crossover set too high. I love it. Can't really hear them outside the cab which is a good thing because if you cruise around town with subs and let everyone know, they will be gone the next day!

07-26-2003, 01:04 AM	#1
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	ATTN: Need help quick - Check engine light I just finished installing my amp and subs and now my check engine light is on. What two pins to I short to get the codes? Where can I find the codes? I ran the power fro the sub through the firewall in the hole where all the computer stuff comes out of (uh ho). Thanks!! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-26-2003, 01:18 AM	#2
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Come on guys! I need to know tonight! Truck drive perfectly fine but the light is on which scares me because that usually means something is horribly wrong because the computer is so brain-dead! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-26-2003, 01:26 AM	#3
navybear70 hometown heroes! Join Date: Jan 2003 Location: Ewa Beach, HI Posts: 487	You have a check-engine light?!? That's pretty high-tech dude. I gotta check my engine manually! Seriously, I don't know...sorry. __________________ 2009 Silverado 2wd, 121k as of 04APR13. I love my truck 29 days out of the month. The payment is due on the 30th... Do your duty in all things. You cannot do more, you should never wish to do less. -Robert E. Lee "Never give up ground you've already taken." -Unknown

07-26-2003, 01:30 AM	#4
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	I got the trouble code: 34 - A firebird site says it is the MAP or MAF sensor. WTF??? I don't have a MAP sensor or a MAF sensor! This thing is like a "Something is wrong" light. The trouble code really didn't help. Grrrr..... __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 Last edited by apstguy; 07-26-2003 at 02:04 AM.

07-26-2003, 02:02 AM	#5
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	I have been messing with it and sometimes before I start it I get a loud fast continuous clicking (usually I get a soft slow clicking) It sounds like a normal noise that happens at about 1/4 throttle but now before I start it. It has a slower than normal idle but only barely. Since it is black outside (11pm) I can't really see anything. Here is the sensor outlined in red: What the hell is that sensor? A MAP sensor? I ran my hand down the vaccuum line and it is cut. Is that my problem? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-26-2003, 10:59 AM	#6
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	TTT __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-26-2003, 11:33 AM	#7
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	yes. repair or replace the vacuum line and the problem should go away. BTW, the MAP really does not have a lot of effect on the way your truck will drive, so it is not something to really worry about. The light is more of a nuisance on a carbed vehicle anyhow. The reason it is on is because the sensor is not getting a vacuum signal without the line attached. Make sure the plug is in tight, put vacuum to it, and it will be fine. __________________ 1974 Jimmy- 5.3/4L80e/NP241

07-26-2003, 02:17 PM	#8
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Thanks! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-28-2003, 12:36 AM	#9
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	That night it was dark and I was tired and hot. I looked at it today and found that the line was just un-plugged! Problem solved! I did however find out they don't make that hard plastic emissions vaccuum tubing anymore. Not the Chevy dealer, Kragen, or Autozone has it. Kragen used to 6 months ago. Maybe I get one of those special emissions exempt things because my hoses are all split? (I don't know HOW that would happen...) __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-28-2003, 01:41 AM	#10
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	How do the subs sound?? __________________ I have a few cars... See Them Here

07-28-2003, 01:48 PM	#11
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Subs are great! I have to fine tune the amp though, it can get a little boomy at times. I have the crossover set too high. I love it. Can't really hear them outside the cab which is a good thing because if you cruise around town with subs and let everyone know, they will be gone the next day! __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

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