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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 02-19-2010, 02:20 PM   #1
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5.7 iroc no start

Fuel pump primes but how do I know for sure it works? Car just cranks, it has spark and the fuel pump sounds good...what else can I do?
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Old 02-19-2010, 02:38 PM   #2
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Re: 5.7 iroc no start

My best guess without more information is that the ignition module is bad, plus it is the easiest thing to check most auto parts stores can do that.
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89 Formula, Maui Blue,355 TPI(used to be TBI) Auto, B&M shift kit, afpr, 3.42 Richmond gears, auburn posi. 3" Flowmaster cat back system.
86 Camaro Z28 LB9 T-tops pretty much stock
current ride 2004 Cadillac Deville.
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Old 02-19-2010, 03:27 PM   #3
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Re: 5.7 iroc no start

Hook up a fuel pressure guage to it and make sure you are getting fuel.
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Old 02-21-2010, 07:49 PM   #4
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Re: 5.7 iroc no start

unplug tps and see if it starts...if shorted sytem is in clear flood ...no pulse....does it have vats?
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Old 02-22-2010, 02:38 PM   #5
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Re: 5.7 iroc no start

Quote:
Originally Posted by bcmag View Post
unplug tps and see if it starts...if shorted sytem is in clear flood ...no pulse....does it have vats?
Gonna try that and no VATS BTW...also I may still not be getting fuel even though the pump primes right??? thanks for helping.

Last edited by LS7Roc; 02-22-2010 at 02:41 PM.
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Old 02-22-2010, 03:46 PM   #6
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Re: 5.7 iroc no start

Quote:
Originally Posted by LS7Roc View Post
Gonna try that and no VATS BTW...also I may still not be getting fuel even though the pump primes right??? thanks for helping.
Check fuel pressure. Ohm out your injectors as well. Just this past week 2 of my old injectors ohm'd out at <10 ohms, needless to say the car would only start using starter fluid. Purchased a new set of injectors and problem solved she fires right up.

Also a tip. If you ohm out one of your injectors and it is reading real low (less than 12), unhook it and then try to start the car. If the injector was indeed your problem the car will now fire right up.
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Old 02-25-2010, 02:19 PM   #7
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Re: 5.7 iroc no start

Quote:
Originally Posted by jmat2407 View Post
Check fuel pressure. Ohm out your injectors as well. Just this past week 2 of my old injectors ohm'd out at <10 ohms, needless to say the car would only start using starter fluid. Purchased a new set of injectors and problem solved she fires right up.

Also a tip. If you ohm out one of your injectors and it is reading real low (less than 12), unhook it and then try to start the car. If the injector was indeed your problem the car will now fire right up.
Hey, I disconnected the injectors one by one and cranked it, still no start. It has spark and the fuel shoots when I push the test valve while cranking. Nothing still...
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Old 02-25-2010, 02:20 PM   #8
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Re: 5.7 iroc no start

Quote:
Originally Posted by LS7Roc View Post
Hey, I disconnected the injectors one by one and cranked it, still no start. It has spark and the fuel shoots when I push the test valve while cranking. Nothing still...
What was the ohm reading on each injector?
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Old 02-25-2010, 03:22 PM   #9
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Re: 5.7 iroc no start

Quote:
Originally Posted by jmat2407 View Post
What was the ohm reading on each injector?
Hi, I didn't check the ohm readings, I just disconnected them one by one and cranked it...no start..is is safe to say that my fuel pump is good since it primes and I have fuel shooting out..?
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Old 02-25-2010, 05:00 PM   #10
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Re: 5.7 iroc no start

Your car is not producing an injector pulse, check the plugs on the back of the distributor, if they are good and tight then change out the ignition module.
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89 Formula, Maui Blue,355 TPI(used to be TBI) Auto, B&M shift kit, afpr, 3.42 Richmond gears, auburn posi. 3" Flowmaster cat back system.
86 Camaro Z28 LB9 T-tops pretty much stock
current ride 2004 Cadillac Deville.
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Old 02-25-2010, 05:00 PM
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