89 454 tbi problems and ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

osbornl1 · 08-30-2012, 12:41 PM

Ok so here goes nothing.

Having problems with it running rich. At first I thought the injectors were suppose to spray constant but now I have read they should pulse.

Iac good map good tps good. My injectors spray a good pattern they just spray all the time with no pulsing except during cranking.

Can someone help me out.
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Hulk Will Smash · 08-30-2012, 03:40 PM

Mine don't really seem to pulse either, unless it's very slight. On cold start I can smell fuel from 50 feet away it's so rich. But truck runs all right so I've just let it ride. I have cell phone video of it but can't post.
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mopar346 · 08-30-2012, 09:59 PM

The pulse is constant and quick, it almost appears continous but it is detectable if you stare at it. I would check the O2s and install a 3 wire (pre-heated) if you don't have one.

osbornl1 · 08-31-2012, 12:41 AM

The o2 sensor is one code it's throwing cause I have a leak in the manifold causing air to be sucked in and the sensor to read lean. Found that out about 3 hours ago when a ses light came on. Found crack after it cooled down.
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Hoods69BadBowTie · 08-31-2012, 07:18 PM

I have a bad temp sensor on the front of my block on my '88 chevy TBI motor. Would cause it to stay running rich n kinda high idle thinking that it needed more fuel then it actually did. Might be worth a shot its easy and cheap. Its the sensor in the very front of the intake that threads into it. Have you ever messed with the timing on it before?

osbornl1 · 09-01-2012, 09:00 AM

No I haven't messed with timing. I did replace the temp sensor but it was closer to the front of the engine than than how u described it.

Can someone send me the firing order of the cylinders in case I replace cap and rotor etc. really considering a carb swap with long tube headers.
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mopar346 · 09-01-2012, 09:05 AM

The firing order and rotation are cast into most factory intakes for future reference.

18436572 clockwise, the #1 plug wire is USUALLY located on the cap closest to the front to the passenger side. The driver's side cylinders are 1,3,5,7 from front to back, passenger's side 2,4,6,8.

08-30-2012, 03:40 PM	#2
Hulk Will Smash Registered User Join Date: Apr 2006 Location: Huntington Beach, CA Posts: 492	Re: 89 454 tbi problems and ?'s Mine don't really seem to pulse either, unless it's very slight. On cold start I can smell fuel from 50 feet away it's so rich. But truck runs all right so I've just let it ride. I have cell phone video of it but can't post. Posted via Mobile Device __________________ '87 R30 Crew Cab Dually It's 11 PM, do you know where your IAC pintle is?

08-30-2012, 09:59 PM	#3
mopar346 Registered User Join Date: Jan 2011 Location: Quincy, FL Posts: 533	Re: 89 454 tbi problems and ?'s The pulse is constant and quick, it almost appears continous but it is detectable if you stare at it. I would check the O2s and install a 3 wire (pre-heated) if you don't have one.

08-31-2012, 12:41 AM	#4
osbornl1 Registered User Join Date: Mar 2011 Location: Cincinnati Ohio Posts: 55	Re: 89 454 tbi problems and ?'s The o2 sensor is one code it's throwing cause I have a leak in the manifold causing air to be sucked in and the sensor to read lean. Found that out about 3 hours ago when a ses light came on. Found crack after it cooled down. Posted via Mobile Device

08-31-2012, 07:18 PM	#5
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: 89 454 tbi problems and ?'s I have a bad temp sensor on the front of my block on my '88 chevy TBI motor. Would cause it to stay running rich n kinda high idle thinking that it needed more fuel then it actually did. Might be worth a shot its easy and cheap. Its the sensor in the very front of the intake that threads into it. Have you ever messed with the timing on it before? __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

09-01-2012, 09:00 AM	#6
osbornl1 Registered User Join Date: Mar 2011 Location: Cincinnati Ohio Posts: 55	Re: 89 454 tbi problems and ?'s No I haven't messed with timing. I did replace the temp sensor but it was closer to the front of the engine than than how u described it. Can someone send me the firing order of the cylinders in case I replace cap and rotor etc. really considering a carb swap with long tube headers. Posted via Mobile Device

08-30-2012, 12:41 PM	#1
osbornl1 Registered User Join Date: Mar 2011 Location: Cincinnati Ohio Posts: 55	89 454 tbi problems and ?'s Ok so here goes nothing. Having problems with it running rich. At first I thought the injectors were suppose to spray constant but now I have read they should pulse. Iac good map good tps good. My injectors spray a good pattern they just spray all the time with no pulsing except during cranking. Can someone help me out. Posted via Mobile Device

09-01-2012, 09:05 AM	#7
mopar346 Registered User Join Date: Jan 2011 Location: Quincy, FL Posts: 533	Re: 89 454 tbi problems and ?'s The firing order and rotation are cast into most factory intakes for future reference. 18436572 clockwise, the #1 plug wire is USUALLY located on the cap closest to the front to the passenger side. The driver's side cylinders are 1,3,5,7 from front to back, passenger's side 2,4,6,8.

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