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5.7 TBI rough start help

Thought of something. Unhook the timing advance wire before a cold start and see if it runs smooth but sluggish. Mine would, and that led me to believe the timing was being overadvanced. Sonny
- Sonny Baker
- Post #9
- Jan 15, 2018
- Forum: Engine Performance + Maintenance
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5.7 TBI rough start help

I see you replaced the distributor. Did you replace the Ignition control module ? I just went through this exact same thing with my 91 TBI and replaced all the parts you have ( except the distributor) and finally fixed it when I replaced the ICM. Truck ran great on a cold start above about 50...
- Sonny Baker
- Post #8
- Jan 15, 2018
- Forum: Engine Performance + Maintenance
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1991 5.7 TBI runs rough when cold

I thought of something. Since the engine does not miss/ stumble at cold start with the ESC wire disconnected, are there any other sensors that the ECM "ignores" with this wire disconnected and returns the setting back to a predetermined value? Thanks, Sonny
- Sonny Baker
- Post #8
- Dec 31, 2017
- Forum: Engine Performance + Maintenance
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1991 5.7 TBI runs rough when cold

Update.......You guys are on to something. Here is what I have done and what I have found. I have: Removed wires cap and rotor. I polished the distributor stem and reinstalled cap and rotor. Reinstalled wires per the Service Manual and ensured 5 & 7 wires are routed apart from each other...
- Sonny Baker
- Post #7
- Dec 31, 2017
- Forum: Engine Performance + Maintenance
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1991 5.7 TBI runs rough when cold

I must be missing something here, but I am about out of ideas. I have a 1991 c1500 5.7 tbi with 115,000 miles on it. The truck misses for about 30 seconds after start up when the outside temperature is below 50 degrees. I have done all I can think of to this point and need some others opinions...
- Sonny Baker
- Thread
- Dec 21, 2017
- Replies: 22
- Forum: Engine Performance + Maintenance