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Originally Posted by Tyler Townsley
You have the thought process down but the specific steps could use some work.
1. Compression check.
2. Run the car, park it and look at the plugs they should be uniform in appearance if not then chase fuel/spark on that cyl.
3.Take a good known plug and one cyl at a time unplug the wire, plug in the plug, lay it on the plenum and start the car. The spark should be the same on every cyl if not then you know which coil pack/wire to chase for problems.
4. There is a DIS checker and should you suspect the dis of falling apart I can lend it to you. You need some kind of a scope to look at the signals to verify its falling apart.
5. If you pull the plenum then you can check the injectors by pulling fuel rail up, crank the car and look at the spray pattern.
6. If you have a suspect cyl you can eliminate spark with step 2 and check fuel by swaping injectors from cyl to cyl, this requires pulling the plenum but you get pretty good at in with practice.
7. Listen for the vacuum pump at the left front of the car. You should hear it cycle for a couple of seconds when the key is first turned on the go quiet for at least 5-10 minutes. Both failing to pull the vacuum, on start and an continuly cycling pump signal problems that will cause what you describe.
Let us know what you find.
Tyle
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Tyler, yours is the kind of testing that is guided by the intuition gained by experience...the kind I'm always interested in!
Well...
- Compression check: Good point. I'll check it.
- Plugs: All plugs are uniform in appearance; no plug varies in appearance from the others to anything significant.
- Coil pack: Ah-HA!
- DIS: I hope it doesn't come to that (gotta round up an "O" scope somewhere (ebay?) to do that). But, if I have to take ya up on that, I deeply appreciate the offer to use your test equipment, "fer sher".
- Injector function: I guess I would have to latch the secondary relays to observe those injectors at the same time (not to mention doing it in a well ventilated area!)
- Swapping injectors: Good, logical procedure. Thx.
- Vacume pump: I'll check the actuator vacume for leaks and check the pump as well (same tool).
Many thanks for your insight and suggestions. Even if it turns out to be something else, I appreciate the help with "specific steps" in view of the symptoms I have.
Truth be known, this "little" annoyance I'm experiencing is giving me a reason to spend hours researching the LT5's operation - what makes it tick.
This way I can be really dangerous!!
P.