fuel injector question
Thread Starter
Safety Car
Joined: Jul 2002
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From: SCMR Rat Pack'r Charter Member, Inland Empire Chapter
fuel injector question
Ive been having a rough idle problem. A friend suggested checking the injectors. He said to disconnect the injectors 1 at a time while it was idling to see which injector, if any, is causing the problem. His thinking was that when I disconnected the bad injector there would be no change in the rough idle but when I unplugged good injectors the idle would get rougher. Well, what happened was unplugging them 1 at a time had absolutely no effect except for the number 3 cylinder. I unplugged that injector and it stalled and died. I unplug any of the others and theres no change at all. Does that mean I have 7 bad injectors? Its a '91 L98 coupe, ZF6 speed w/108k miles. Thx for any info.
Le Mans Master
Joined: Dec 2000
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From: San Diego, Ca
Re: fuel injector question (DarkHalo)
Unplugging the injectors one at a time should have no effect. The IAC will compensate and maintain idle. Retest and if stalls on #3 again, check the connector for a short to ground and/or verify that the wiring is in good shape. An open in the harness or a short will kill all the injectors and cause it to stall. Also check the injector fuses. Otherwise, if want to check injectors, measure resistance across the terminals. They should all be the same. Other than that, you can run a balance test which will require a special tool to energize each injector and a fuel pressure gauge to measure the pressure drop.
Thread Starter
Safety Car
Joined: Jul 2002
Posts: 4,548
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From: SCMR Rat Pack'r Charter Member, Inland Empire Chapter
Re: fuel injector question (SunCr)
7 of the 8 are 17.5 ohms resistance and the 8th one is 4 ohms. And guess what....thats the number 3 injector. Maybe thats the bad one and the others are good?
Melting Slicks
Joined: Mar 2001
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From: Lake Villa IL
Cruise-In IV Veteran
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St. Jude Contributor
Re: fuel injector question (DarkHalo)
First off, check the archives. There's a ton of info about injectors.
Second, if one is bad, with 108K, remove them all and send them off to Cruzinperformance (approx $120). Or, buy a set of Accel's from Summit ($240).
Injectors have a life span, and you're at it.
:cheers:
Second, if one is bad, with 108K, remove them all and send them off to Cruzinperformance (approx $120). Or, buy a set of Accel's from Summit ($240).
Injectors have a life span, and you're at it.
:cheers:
Thread Starter
Safety Car
Joined: Jul 2002
Posts: 4,548
Likes: 3
From: SCMR Rat Pack'r Charter Member, Inland Empire Chapter
Re: fuel injector question (joeveto)
I did a search first and there wasnt much as far as injectors go. SLP Performance online sells a set of 8 Bosch injectors for $99 and thats what I think Im gonna do. I understand the Bosch is worlds better than the stock Multecs they used in my year.
http://www.slponline.com/view_produc...&SHOWEMAIL=Off
Well shoot...I was checking "recent" rather than "archived" topics for injector info....
[Modified by DarkHalo, 12:52 PM 10/15/2003]
http://www.slponline.com/view_produc...&SHOWEMAIL=Off
Well shoot...I was checking "recent" rather than "archived" topics for injector info....
[Modified by DarkHalo, 12:52 PM 10/15/2003]
Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: fuel injector question (DarkHalo)
I did a search first and there wasnt much as far as injectors go. SLP Performance online sells a set of 8 Bosch injectors for $99 and thats what I think Im gonna do. I
