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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

88 Chevy Blazer, Light Throttle Chugging
Q: I own an '88 Chevy Blazer 350 engine with 110K miles. When I first start it, it runs well, but as soon as it warm up, and I press lightly on the accelerator it starts chugging. If I let off the gas it will stall. When I start it back up, it idles fine but as soon as I put light pressure on the throttle it starts chugging again. If I put it in neutral and rev it up, before it stalls it will idle smoothly. I have replaced the oxygen sensor, map sensor, throttle position sensor, and coolant temperature sensor. This has helped some but did not cure the problem. Someone suggested replacing the EGR valve. What would you suggest? Baffled in New Hampshire.

A: The EGR valve is a possibility but, I wouldn't recommend replacing the EGR valve on a guess. The simplest way to prove if the EGR valve is a factor in your stalling problem is to temporarily disable it. If temporarily disabling the EGR valve corrects your stalling problem then you're headed in the right direction. But don't replaced the valve yet. Be sure that the vacuum supply to the EGR valve is correctly routed. Something as simple as a misdirected vacuum hose can create a myriad of driveability problems that no replacement part can correct. There is one rule that you should follow when diagnosing problems such as yours. If you can't prove it's broken, don't replace it.

 
     
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