phoneman1

My truck has now been in two different shops for 3 months and the mechanics cannot figure out my problem. The engine has a dead miss on cylinders 1 and 2. Compression is good. Spark plugs, wires, injectors, distributor cap have all been changed. Each mechanic suggest either selling the truck or dropping in a rebuilt engine. Any suggestions would be appreciated.

millball

If there is compression, fuel and spark at the right time, the cylinders must fire.
Sounds like your mechanics troubleshooting skills are'nt worth a poop.

RJR

What do you mean by "dead miss"? Do those cylinders not fire at all? How do you know that?

What do the plugs look like after running for a while? If they're black and carboned up it's an ignition problem. If they are dry it's a fuel problem. If they're all oily you've got a valve guide or ring problem that is dumping in excess oil and fouling the plugs.

BTW, these are things the mechanics should have checked before replacing any parts.

phoneman1

When you pull the #1 and #2 plug wire the idle does not change.

millball

Well, as you said in your first post, the miss is in #1 and #2 cyls.
Still don't know definitely wether its spark, fuel, or compression, or a combination of these that is the problem.
Will an inductive timing light trigger off both #1 and # 2 plug wires??
This test will tell whether the high voltage from the coil is getting to these plugs.
Gotta start somewhere.

bswarm

Plug wires crossed on 1 and 2?