My issue was burnt plug wire(s). They were Taylor pro and less than 6 months old when the issue started. Just ohming them cold didn’t show any issues. I put a cheap set of Autozone 7mm wires on just long enough to determine that was the problem. Now I’m running blue streak 8.5 mm with thermal...
Thanks for the clarification on EGR operation by Schurkey. That’s the great thing about this forum is that we all learn and can fine tune our knowledge. If the EGR valve is partially blocked open by carbon buildup, it can mess with the air fuel ratio during cold engine operation and cause a...
Sounds like bad wire/connection causing fuel pump relay to drop out momentarily. Could be why it ran fine on starting fluid.
Disconnecting MAP drives voltage input toward 0 (no vacuum) and ecm responds by dumping in fuel. Means either you are getting too much air or too little fuel under normal...
If someone could post a pic of the Type A seal we could see if the shape was the same. I’d pay for 94 seals from LMC if I thought I could fit by cutting and gluing. Like building an O-ring out of round rubber. Just need to know if the backside will fit in the trough of the 95 frame.
2.5 hrs by...
I’m looking at heat boots now for the new set of wires. Hadn’t thought about megging plug wires. Would be nice if the parts stores carried a plug wire tester.
Thanks for feedback guys!
I don’t see any adjustments on my 95 ecsb. I found your post searching for “quarter window”. Mine are also leaking and one has a torn rubber seal. Quarter windows start to rattle a little and leak when the rubber loses its elasticity. I’d like to just replace the seals, but it looks like on LMC...
I’m cautiously optimistic that the miss is fixed. Bought a cheap set of plug wires just to rule out wires as suspect. Truck runs great with no miss or hesitation. Plug wires were Taylor pro 8mm and only 4 months old when issue started. Headers must have gotten them. Strange because they ohmed...
Heat/load misses seem to be a common topic on this forum. I’m currently chasing one of my own. If you google “Symptoms of failing (insert component here)”, nearly every hit you get will list a miss or poor engine performance as a symptom. MAP, Ignition Control Module, pickup coil, distributor...
Here are 2 screenshots of rough acceleration. This is just normal coming up to speed with 2 shifts. Top image is RPM (green), spark advance (blue) and MAP (red). Bottom pic is RPM, Advance, and O2 (red). I don’t have a wideband O2, so no data there. I have a full set of tuner pro Rt data logs...
Replaced distributor just to rule it out. Also put in my spare MAP sensor. No change in performance. Still drops out like a miss or stumble during acceleration. Will replace plug wires tomorrow (always wanted a spare set) even though these have ohmed out good. Running out of things to...
Distributor is not a Delco. It’s the autozone Duralast. The pickup coil I removed didn’t look burned, but I replaced it anyway with no change. Even with a new pickup and ICM, could there be enough slop in a 6 month old Distributor to cause a miss during acceleration?
With truck idling (cold), I...
Has anyone ever had an ignition switch start to go bad and cause a miss? From the Haynes book, power to the coil comes directly from the ignition switch. If the switch contacts weren’t making up all of the way, could that cause an issue? I’m running out of things to test or replace.
Since new “bad” parts can complicate troubleshooting on a new install, you may want to install them on the old engine, assuming it runs, and drive for a few weeks to see if they are good or not. Things like temperature sensors, O2 sensors and ignition coils are pretty easy to swap. Fuel pump is...
I haven’t posted in a while but now need some help troubleshooting. Truck runs fine for about 15 minutes but then starts missing, especially on acceleration or under load. It ran fine for the last 6 months after engine swap. Many of the parts that were transferred over during the swap had been...