Still having an issue...

[danielhv]

Car was running fine, put a blower on it and had it tuned after I changed the injectors over to 42 pounders and ever since then it has ran weird intermittently. Sometimes it runs just fine, but then all the sudden it feels like a cylinder drops out and idles rough, runs lean, and lacks power. Then all the sudden it will snap out of it and go back to normal.

I ran a cylinder balance test, and it showed an issue with number 7. I suspected that the fuel injector had an issue since it was bought used. Last night I moved the injector two a different cylinder, ohm checked all of them, cleared all the ECM codes, and ran the cylinder balance test again and number 7 still fails. I don't see any breaks in the injector harness and no change in idle A/F ratio while jiggling the harness in various places. I also double checked the plug, seems fine. Autolite 24s.

What now?



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[dee]

Check your signal wires. Usually they splice in at a common area. Also ohm the wires while doing a wiggle test It's not uncommon to have wires break inside their insultion.

[danielhv]

Checked the signal wires... Got a noid kit, verified good signal on a different cylinder, then tested #7 and got nothing.

Ohm'd from ECC to salt & pepper plug = .002
Ohm'd from salt & pepper plug to injector plug = .004

No change with any jiggling. Had a solid beep on my DVM so I feel like it has good continuity.

I tried on another computer that I had laying around, and the injector lit up at that point.

Does this mean the computer is bad? It's an A9L... can I just swap it out with one from Autozone or what?

[danielhv]

Nevermind, autozone didn't have any, neither did any of the other places.

Anybody have a spare A9L sitting around?

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[Baron Von Crowder]

wait, isnt it bank to bank on these? If you have one dead one, there is a wire broken somewhere, id think.

[danielhv]

wait, isnt it bank to bank on these? If you have one dead one, there is a wire broken somewhere, id think.

I traced the wire all the way back to the ECM and its good. I tried a different computer, and the noid light lit up while cranking. Put the A9L back in, and no more light.

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[Andy@PrimeTuning]

I traced the wire all the way back to the ECM and its good. I tried a different computer, and the noid light lit up while cranking. Put the A9L back in, and no more light.

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What different computer was it? Clean the port very well and that chip will override the slightly different tune on the ECU itself so u can try it with that different computer.

[danielhv]

What different computer was it? Clean the port very well and that chip will override the slightly different tune on the ECU itself so u can try it with that different computer.

Its a DA1... Its my old speed density computer. Won't work will it?

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[dee]

No you need another A9

[shumpertdavid]

I've got an A9P from an auto car, $75 shipped to you, pm if interested.

[Andy@PrimeTuning]

I've got an A9P from an auto car, $75 shipped to you, pm if interested.

This would work just fine

[naynay]