Injector issue
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Joined: Apr 2014
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Injector issue On my 97 T/A w/lt1 2 injectors aren't firing. While car was running I unplugged all injectors 1 at a time and #4 and #8 made no change in the idle. Anyone have any suggestions on what I should check first?
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Joined: Sep 2010
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Easy way to tell if the injector is firing or not is to put a screwdriver against it and your ear against the screwdriver, you'll hear a clicking. Or most of the time you can feel it click.
Stick a test light in it and have someone crank it.
BB455 -
Check PWR and GND at the 2-pin connectors of the two suspect injectors with the engine idling; if the wiring tests OK (i.e. - no opens, no shorts to GND or B+ on either wires, and your test lamp pulses indicating B+ duty cycle), then the issue is two dirty or failed injectors.
Using an engine stethoscope, you can also listen to the injector body for the Tell-Tail "Tick Tick Tick Tick" at idle.
A dirty injector can be cleaned, but a failed unit must be rebuilt / replaced.
Good luck.
Check PWR and GND at the 2-pin connectors of the two suspect injectors with the engine idling; if the wiring tests OK (i.e. - no opens, no shorts to GND or B+ on either wires, and your test lamp pulses indicating B+ duty cycle), then the issue is two dirty or failed injectors.
Using an engine stethoscope, you can also listen to the injector body for the Tell-Tail "Tick Tick Tick Tick" at idle.
A dirty injector can be cleaned, but a failed unit must be rebuilt / replaced.
Good luck.
Thread Starter
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Joined: Apr 2014
Posts: 11
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Thanks for responding guys I appreciate the advice. Sorry it's been a while, been out of town working. So my problem seems to be only on #8 cylinder now, had injectors cleaned and tested. A couple weren't flowing correctly. Voltage on all plugs were the same, 14v with car running. Put injectors back in and #8 still makes no change when I unplug it while the car is running. Compession tested and got 130lbs. So that seems good, not really sure what do next. Very frustrating! Could it possibly be a burnt or bent valve? How can I tell? And if it is a valve can I remove the head with engine still in the car? Thanks for any help.
