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

I gots problems....

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Old May 17, 2005 | 06:35 PM
  #81  
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The resistace of the injectors has little or nothing to do with whether they leak or not So far, you've only half tested them.

RACE ON!!!
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Old May 17, 2005 | 06:46 PM
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Originally Posted by bogus
But 2 - #s 4 & 6 were wet - that's cause THE CYLINDERS WERE FULL OF GAS!!!!!!!!!!! yes... premium unleaded. I am letting the engine breath for the time being.
Yikes!! Hydraulic locked!!! Hard to believe it would fill the cyliders up so quick that it wouldn't roll over!
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Old May 17, 2005 | 07:32 PM
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Originally Posted by CFI-EFI
The resistace of the injectors has little or nothing to do with whether they leak or not So far, you've only half tested them.

RACE ON!!!


If I where you I would
1. pull the fuel rail and place a cup under each injector and turn the Ingnition to on NOT start and see what you have.

2. If they are leaking the Isolate the problem By disconnecting the injector harness from them and again turn the ingnition on and let the fuel pump run, If it solves the problem it is a bad injector if not it's probably either a short or bad ECM

Hope this help, I have been down the injector road before so I have a couple of tricks if you help drop me a e-mail
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Old May 17, 2005 | 08:05 PM
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Andy, I have a box of injectors off a 92 that were flow tested. I bought them off a forum member, but ran into problems, 4 of them work perfectly, two don't work, and two just spit a solid stream of fuel.

And unfortunately, I probably don't have written down which ones work. May be more trouble than it's worth, but let me know if you want them. I personally ran them on my fuel rail upside down and observed the spray patterns to identify the problems.

Last edited by CentralCoaster; May 17, 2005 at 08:08 PM.
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Old May 17, 2005 | 08:07 PM
  #85  
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Originally Posted by CFI-EFI
The resistace of the injectors has little or nothing to do with whether they leak or not So far, you've only half tested them.

RACE ON!!!
In fact, the resistance doesn't say much about the flow in general. As mentioned in my previous post, those 8 injectors, 4 of which work, ALL of them have the proper ohms.
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Old May 17, 2005 | 08:07 PM
  #86  
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I ain't doing ****....

I just drained the crankcase, and 2+ gallons of a gas and oil mix came out.

I am not happy... I bought the AFPR from summit racing last May, 17. It's an Accel brand.

I am going to contact Summit and Accel. Someone (Accel) is buying me a new motor. This is very poor.

I am going to test the rest of the system, but the other day, I pulled plugs 2 and 4, and found nothing wrong, I stopped then and decided to get the car home.

Today I removed all the plugs, and found 4 and 6 full of fuel.

I am not expecting a happy ending.
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Old May 17, 2005 | 08:10 PM
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Run a compression check!

Did the AFPR include the diaphram, or was it a cheap one that reuses the stock one?
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Old May 17, 2005 | 08:19 PM
  #88  
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Originally Posted by bogus
I ain't doing ****....

I just drained the crankcase, and 2+ gallons of a gas and oil mix came out.

I am not happy... I bought the AFPR from summit racing last May, 17. It's an Accel brand.

I am going to contact Summit and Accel. Someone (Accel) is buying me a new motor. This is very poor.

I am going to test the rest of the system, but the other day, I pulled plugs 2 and 4, and found nothing wrong, I stopped then and decided to get the car home.

Today I removed all the plugs, and found 4 and 6 full of fuel.

I am not expecting a happy ending.
dude....I feel for ya'...that sux !!!! Any chance the fuel simply passed through your piston rings while you were trying unsuccessfully to crank over the engine?? any unburnt fuel sitting on the top of the pistons would find it's way down to the crankcase....or am I being stupid??

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Old May 17, 2005 | 08:21 PM
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Bogus,
Check the injectors first. It would take the AFPR a while to dump that much fuel into the intake through the tiney vacume tube but a few bad injectors could do it in a hurry.
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Old May 17, 2005 | 08:53 PM
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Originally Posted by MikeC4
dude....I feel for ya'...that sux !!!! Any chance the fuel simply passed through your piston rings while you were trying unsuccessfully to crank over the engine?? any unburnt fuel sitting on the top of the pistons would find it's way down to the crankcase....or am I being stupid??

I blew a head gasket before and that filled the case with coolant, without breaking the rings. Fuel would get in there even faster. I just have a hard time seeing how several cylinders would fill up with gas, or how several injectors would fail at once.

But here's a thought:

On my 85, the intake base has holes in the bottom of EACH intake passage, and they're all connected to eachother. This is where the FUEL vapor cannister and pcv purges to. If that system filled with fuel, pressure from the fuel tank could feasibly force fuel into the intake base and slug several cylinders at once. I don't know if your charcoal canister vents to atmosphere on the 92, but I'd sure as heck check those lines for fuel! Also, if it's in there, it could feasibly enter the crank case through the pcv line, it's all connected, at least on my L98.

I don't know how much of this plumbing is in common with the LT1.

Another faint possibility, is if one injector leaked, or the AFPR leaked bigtime into one cylinder, it could backup and fill this vapor cannister/pcv area of the intake base and get into multiple cylinders. That doesn't sound as likely though.
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Old May 17, 2005 | 08:53 PM
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I had fuel in the afpr vacuum line...

I am going to check the injectors, but I can't without a good fpr!!! that would create major leakage... bad... very bad...

The FPR for LTx's is not like the units on the L98. It has a diaphram, I am sure of that, but they are not units like the L98 with the little dome and such. This is a sealed unit.

I just hope there hasn't been any damage done to the internals.

I am off to the parts shop to get stuff...

Wish me luck.
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Old May 17, 2005 | 08:57 PM
  #92  
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Originally Posted by bogus
I am going to check the injectors, but I can't without a good fpr!!! that would create major leakage... bad... very bad....
Just cap the lines, you don't need vacuum there to run it, it'll just be a little rich. I don't know if a leaky fpr will work though, or if it will underpressurize the system? (Or if it will shoot fuel out the vacuum port on the fpr onto a hot engine and set you on fire.)

Also, I tested my injectors just by cranking the engine over with the fuel rail lifted and hooked up. (and spark disabled just to be safe)
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Old May 17, 2005 | 09:08 PM
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Originally Posted by bogus
I had fuel in the afpr vacuum line...

I am going to check the injectors, but I can't without a good fpr!!! that would create major leakage... bad... very bad...
I just hope there hasn't been any damage done to the internals.
I am off to the parts shop to get stuff...

Wish me luck.
Ok now your diagnosis makes more sense to me. I wish you where closer I have a spare FPR in the garage I could let you try as well as a test rig for the injectors, although I doubt you will need it. Good luck
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Old May 17, 2005 | 09:33 PM
  #94  
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Curious why you even had an AFPR? Was your original bad or did you at one time fall for all the hype? I've heard very bad things about Accel injectors, maybe their AFPR is junk too.

Not that it'll make a ton of difference now, but might I suggest a perm. mounted fuel pressure gauge? It allows for an instant check of your fuel pump and pressure regulator every time you turn the key on. It's one of those gauges that I just take very much for granted now, almost as much as my oil pressure! To date I've never really needed it to diagnose a problem per say, but I can very quickly say what my problem isn't.
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Old May 17, 2005 | 11:16 PM
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I got the AFPR, cause I thought my old one was DOA...

I just got a stock part (autozone) if nothing else it will prove a point... it does have a 1 year warrantee.

I agree about the Accel injectors vis-a-vis AFPR. I will learn more when I call them tomorrow - but not until I test the injectors.
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Old May 17, 2005 | 11:32 PM
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My headgaskets are gone. Should I rebuild it or just put a GM crate
engine in cost about 1,200 with 7 year 70000 mile warranty. my car is a 1990 with 97000 on it. What is your opion. Thanks guys and gals
Save the wave. RJ
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Old May 18, 2005 | 12:37 AM
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Originally Posted by onevette01
My headgaskets are gone. Should I rebuild it or just put a GM crate
engine in cost about 1,200 with 7 year 70000 mile warranty. my car is a 1990 with 97000 on it. What is your opion. Thanks guys and gals
Save the wave. RJ
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To I gots problems....

Old May 18, 2005 | 12:41 AM
  #98  
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Originally Posted by bogus
I got the AFPR, cause I thought my old one was DOA...

I just got a stock part (autozone) if nothing else it will prove a point... it does have a 1 year warrantee.

I agree about the Accel injectors vis-a-vis AFPR. I will learn more when I call them tomorrow - but not until I test the injectors.
eek best case you've got severe washdown of the cylinder walls and internals. I'll bet your engine is clean right now! I had a friend who owned a shop and he had a trick for cleaning engines. He would drain the oil and put in kerosene then idle the motor for a couple minutes and drain it before changing the oil and filter again. He said it worked wonders on high mileage engines.

good luck getting Accel to stand behind their FPR I hope there is light at the end of the tunnel ...
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Old May 18, 2005 | 01:15 AM
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I am thinking, that cause the engine didn't run long - I think the engine didn't hydraulic, but was flooded out - that nothing serious happend.

The engine cranked a few times before it locked up.
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Old May 18, 2005 | 02:23 AM
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Originally Posted by mitymek
may the force be with you
Thank you - we sure could use it!
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