C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Fuel injector problem questions?

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Old Jul 19, 2009 | 04:43 PM
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Default Fuel injector problem questions?

3 weeks ago I started the car for the first time in about 2 months, sounded like it had a slight miss, and wouldn't accelerate over 1500rpm. I put it away and worked on it the following week. I figured the gas went stale so I removed it and put 8 gallons of fresh fuel in, now she wouldn't start. Did some quick tests and found that I had spark, engine cranks, but wont start. I figured maybe air in the system, I bleed the system, still no start. Figured now my problem was more in depth, inspected spark plugs and changed due to carbon build up, tested for spark and found ok, wires ok, distrubutor cap and rotor replaced because I figured it needed it. I figured the ignition system is ok. Now for the fuel side. Fuel pump registers acceptable voltage, I have 42psi at the fuel rail, I also had my brother crank the car while I had the relief valve open on the fuel pressure gauge and I'm getting flow. Checked the fuel injector with noid lights and found power there. So I'm pretty sure its my injectors. What do you think?

Now I'm up in the air weather to replace the injectors with OEM, the same that are in there or the GEN III's. I would like to keep the car all original. What are your suggestions?

Thanks in advance!
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Old Jul 19, 2009 | 05:06 PM
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You need to do an ohm test on the injectors, it will tell you whether they're bad or not. Also check out this link...

http://forums.corvetteforum.com/c4-t...questions.html
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Old Jul 19, 2009 | 05:25 PM
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I did an ohm test and 3 are reading 5 while the rest are reading around 16. This is the first time I stored the car without using a fuel stablizer, I think they might have laquared up and are clogged or sticking. If 3 are bad would it prevent the car from starting?
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Old Jul 19, 2009 | 05:43 PM
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yes, but even if you got it started it would run like crap.
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Old Jul 19, 2009 | 06:40 PM
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Many here, including me, installed Bosch IIIs from FICInjectors. I have yet to read anything bad about them or Jon's customer service.
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Old Jul 19, 2009 | 08:55 PM
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Check out my thread about Jon's Bosch Design IIIs for my LT4. Different engine than yours, but the theory and replacement of injectors still applies.

http://forums.corvetteforum.com/c4-t...long-read.html

SAVE the WAVE!
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Old Jul 20, 2009 | 12:29 PM
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Default Don't waste your time or money

Originally Posted by Topless91L98
3 weeks ago I started the car for the first time in about 2 months, sounded like it had a slight miss, and wouldn't accelerate over 1500rpm. I put it away and worked on it the following week. I figured the gas went stale so I removed it and put 8 gallons of fresh fuel in, now she wouldn't start. Did some quick tests and found that I had spark, engine cranks, but wont start. I figured maybe air in the system, I bleed the system, still no start. Figured now my problem was more in depth, inspected spark plugs and changed due to carbon build up, tested for spark and found ok, wires ok, distrubutor cap and rotor replaced because I figured it needed it. I figured the ignition system is ok. Now for the fuel side. Fuel pump registers acceptable voltage, I have 42psi at the fuel rail, I also had my brother crank the car while I had the relief valve open on the fuel pressure gauge and I'm getting flow. Checked the fuel injector with noid lights and found power there. So I'm pretty sure its my injectors. What do you think?

Now I'm up in the air weather to replace the injectors with OEM, the same that are in there or the GEN III's. I would like to keep the car all original. What are your suggestions?

Thanks in advance!
with OEM junk (Multecs) contact Jon @ FIC and get the Bosch III no doubt about it.
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Old Jul 22, 2009 | 03:58 PM
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Jon does a great job answering questions and I appreciate his help on my 93. The guy that I bought mine from had just put new injectors in, but they were the wrong ones due to a difference for the '93 model. I called Jon and he knew immediately the problem and sent out new ones, and what a change they made. I heard something about a new Bosch 4 series, but not sure if those are for the LT1 or a different engine. If your car is only a show car than use stock GM, but if you want to drive it with reliability go with the Bosch from F.I.C. Great Service!!!
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Old Jul 22, 2009 | 04:35 PM
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That's just not true.
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Old Jul 22, 2009 | 06:39 PM
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From: Charlotte Michigan
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Are you referring to the bosch 4's? I may have made an error when reading the ad, They were Bosch EV 14. I don't think I saw the EV and was thinking Roman Numeral IV when I saw the 14. Sorry for the mistake.
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Old Jul 22, 2009 | 06:42 PM
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please just get BOSH 3 injectors, it is easy, and FIC is a great guy to work with. when I pulled my old ones last week, I could see they wre just old junk, and the new gas will wreck your old ones.

you should get all the replacement gaskets if it is stock intake, and seals for injectors
more than everything you need to do in a couple of hours
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Old Jul 22, 2009 | 06:58 PM
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Go with Jon, I used then in the 90 and it runs great.
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