School me on fuel injectors
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
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From: Bowmanville ont
School me on fuel injectors
I have an 88 with an intermitant long crank/hard starting issue and would like to know the different types of injectors,how to check them,is rebuilding a good idea?Is there an ohm meter check?
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Contact Jon Banner at www.fuelinjectorconnection.com.
Buy the awesome Bosch III injectors for $169 a set and your engine will run Great! Also, check out Jon's injector videos at the top of the C4/Tech Performance section.
To check each injector, remove the connector and put your volt meter on the ohm scale. Next, touch the pos and neg wires to the injector terminals and read the results. It should read between 16.1-16.7 ohms anything less is a weak or failing injector. Do the test with the engine hot and cold.
Buy the awesome Bosch III injectors for $169 a set and your engine will run Great! Also, check out Jon's injector videos at the top of the C4/Tech Performance section.
To check each injector, remove the connector and put your volt meter on the ohm scale. Next, touch the pos and neg wires to the injector terminals and read the results. It should read between 16.1-16.7 ohms anything less is a weak or failing injector. Do the test with the engine hot and cold.
Last edited by GKK; Mar 26, 2010 at 11:15 AM.
Pro
Joined: Oct 2009
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From: vero beach florida
There is a sticky by FIC and it is injectors 101 and yes you can ohm injectors to see if they are bad.
Best to do when hot, under 12 ohms is bad.
Sounds like a bad injector(s), bad FPR, fuel pump leaking or bad pulsator.
My vote would be bad pulsator, then injector.
The Pulsator is right beside the fuel pump and they leak after time, their function is to control how the fuel is sent through the system, i.e. smooth out the pulses of fuel coming out of the pump.
Best to do when hot, under 12 ohms is bad.
Sounds like a bad injector(s), bad FPR, fuel pump leaking or bad pulsator.
My vote would be bad pulsator, then injector.
The Pulsator is right beside the fuel pump and they leak after time, their function is to control how the fuel is sent through the system, i.e. smooth out the pulses of fuel coming out of the pump.
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
Also, your 88 has the Multec Fuel injectors which are not compatible with today's fuels which contain ethanol. Multec fuel injectors are not rebuildable.
Last edited by GKK; Mar 26, 2010 at 11:23 AM.
Drifting
Joined: Oct 2006
Posts: 1,934
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From: Citrus Heights California
For best performance, get a custom tune if you use anything other than stock injectors.
Pro
Joined: Oct 2009
Posts: 679
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From: vero beach florida
The seals of all injectors in the 80's and 90's were not designed to deal w/ethanol's corrosiveness, once rebuilt they work fine.
Just put a set of rebuilt Multitec's in mine, had BoschIII's and I always ran rich, my car like yours calls for 22lb and Bosch are 24.
http://www.justfuelinjectors.com/ser...EVROLET/Detail
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Drifting
Joined: Oct 2006
Posts: 1,934
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From: Citrus Heights California
I did a few mods so I thought 24s would be best. Also, I prefer to buy new injectors instead of rebuilt. I Had a very bad experience with rebuilt injectors.
Safety Car
Joined: Jan 2004
Posts: 3,783
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From: Northern California
Yes, no tune required.
Not all 22lb. injectors will work because some are rated at a different fuel pressure. Jon Banner modified the 22lb. Bosch III fuel injectors to fit and flow the correct amount of fuel with the stock fuel pressure of your year C4.
That's why those who buy injectors from other vendors have to get a tune because the injectors are flowing rich or lean.
Not all 22lb. injectors will work because some are rated at a different fuel pressure. Jon Banner modified the 22lb. Bosch III fuel injectors to fit and flow the correct amount of fuel with the stock fuel pressure of your year C4.
That's why those who buy injectors from other vendors have to get a tune because the injectors are flowing rich or lean.
Last edited by GKK; Mar 26, 2010 at 01:35 PM.
Pro
Joined: Oct 2009
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From: vero beach florida
There is not a 22lb Bosch III, Jon modifies the 24lb, it works for some people and not for others.
And 16.1 to 16.7 is good, then the Bosch III's were all bad out of the box, every one of mine was 15.5 - 15.9 and worked.
If your car is stock, get Multitec's, they are the oem injector.
And 16.1 to 16.7 is good, then the Bosch III's were all bad out of the box, every one of mine was 15.5 - 15.9 and worked.
If your car is stock, get Multitec's, they are the oem injector.
Pro
Joined: Oct 2009
Posts: 679
Likes: 0
From: vero beach florida
As it does to every other injector made at the time, when rebuilt they work flawlessly. Go on the LS1LT1.com and ask, that is where I found out about the ones I bought.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
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From: Tampa Florida
Plenty of things to look at first:Basic tune up (air & fuel filter, plugs) was last done when?
Might just be an issue with the "9th" (cold start injector) and/or circuit issues/sensor.
Check the fuel pressure on the injector rail to make sure your pressure is correct and holding once the engine is turned off.
If you still feel you want to throw parts at it and decide you need injectors there is a ton of injector vendors out there so shop around.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
From: Bowmanville ont
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
From: Bowmanville ont