1988 GMC Truck Repair Question
Topics covered: Rpm, Spark, Compression.
Mileage: 18,000 miles.
Mileage: 18,000 miles.
Asked on December 10, 2011
1988 gmc k1500 5.7 tbi 5 speed runs fine when cold but misses when warm any suggestions?i
I've changed fuel filter,egr valve,dist.cap and rotot button,and pickup in dist.
Asked by d61562Answer
Replied on December 10, 2011
You might do a cylinder balance test, when the problem is ongoing. You usually kill the cylinders one at a time, quickly, by killing spark, Pay attention to the rpms, if you kill a cylinder that has no effect on the rpms, that cylinder is either dead or very weak, then you check fuel--spark and compression on that cylinder.
Any applicable trouble codes? You can check mil codes, yourself. Use a gage and check fuel pressure, when problem is ongoing. You could have a vacuum leak that only shows up after it is warm.
