1988 GMC K1500 5.7 TBI 5 SPEED RUNS FINE WHEN COLD BUT MISSES WHEN WARM ANY SUGGESTIONS?I
1988 GMC Truck
I've changed fuel filter, egr valve, dist. Cap and rotot button, and pickup in dist.
Saturday, December 10th, 2011 AT 4:42 PM
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.