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350 TPI Iroc No Start

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Old Mar 12, 2010 | 03:35 PM
  #1  
LS7Roc's Avatar
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Car: 88Roc Flame Red Black/Gold Pkg
Engine: L98
Transmission: 700R4
350 TPI Iroc No Start

Hello all. This will be my final thread for this problem. Next, Chevrolet dealership. Let's see what happens this time. Here's the problem.

One day, out driving, coming to a stop sign, stop..proceed to accelerate, engine dies.

I checked for spark, initially it had no spark/weak spark...I replaced my ignition coil, module and pickup coil. Now, I have strong spark. Wires are very old though. I hooked up a fuel pressure gauge and I have 45psi at the rail and little bleed after key off...pressure is steady at 40PSI. Fuel pump primes and relay is working.

Ohmed injectors, all are 16.1/16.2...checked for power...it's good. Checked all fuses, grounds, connectors...everything seems fine. I tried a little starter fluid, still doesn't start...just cranks. Seems like it tries to catch sometimes. If I bump the starter, it tries to catch everytime but if I hold the cranking, it just cranks. No codes...except for code 36 way before it died on me. I would disconnect and it would run better, not great but better. Tried disconnecting the MAF and start, no start...disconnected TPS, no start.

Fuel injectors are pulsing it seems...I hooked a test light and it flashes brighter...manual says it doesn't matter how much brighter it flashes, as long as it flashes. What else can I try? Oil pressure switch maybe? How would I know if it's bad? 1988 IROC L98 Auto 160,000KM. Very knowledgable users online, I believe we can figure it out. Thanks to all who have tried so far to help me. (Also, forgive me for starting so many threads)
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Old Mar 12, 2010 | 03:42 PM
  #2  
KNBlazer's Avatar
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Joined: Feb 2010
Posts: 1,125
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From: San Diego, California
Car: Trailblazer EXT 4.2 (Firebird Form)
Engine: 5.1 4bbl
Transmission: 700R4 Mega Raptor Level 4
Axle/Gears: 2.73
Re: 350 TPI Iroc No Start

Originally Posted by LS7Roc
Hello all. This will be my final thread for this problem. Next, Chevrolet dealership. Let's see what happens this time. Here's the problem.

One day, out driving, coming to a stop sign, stop..proceed to accelerate, engine dies.

I checked for spark, initially it had no spark/weak spark...I replaced my ignition coil, module and pickup coil. Now, I have strong spark. Wires are very old though. I hooked up a fuel pressure gauge and I have 45psi at the rail and little bleed after key off...pressure is steady at 40PSI. Fuel pump primes and relay is working.

Ohmed injectors, all are 16.1/16.2...checked for power...it's good. Checked all fuses, grounds, connectors...everything seems fine. I tried a little starter fluid, still doesn't start...just cranks. Seems like it tries to catch sometimes. If I bump the starter, it tries to catch everytime but if I hold the cranking, it just cranks. No codes...except for code 36 way before it died on me. I would disconnect and it would run better, not great but better. Tried disconnecting the MAF and start, no start...disconnected TPS, no start.

Fuel injectors are pulsing it seems...I hooked a test light and it flashes brighter...manual says it doesn't matter how much brighter it flashes, as long as it flashes. What else can I try? Oil pressure switch maybe? How would I know if it's bad? 1988 IROC L98 Auto 160,000KM. Very knowledgable users online, I believe we can figure it out. Thanks to all who have tried so far to help me. (Also, forgive me for starting so many threads)
where and how did you check the spark? , the fuel pressure, did you check it while cranking the engine? I would exchange the ignition module, just for kicks... also replace the spark plug wires and spark plugs, especially since you said they are old... again where did you check for spark?

Last edited by KNBlazer; Mar 12, 2010 at 03:47 PM.
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Old Mar 13, 2010 | 12:04 AM
  #3  
LS7Roc's Avatar
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Car: 88Roc Flame Red Black/Gold Pkg
Engine: L98
Transmission: 700R4
Re: 350 TPI Iroc No Start

Originally Posted by KNBlazer
where and how did you check the spark? , the fuel pressure, did you check it while cranking the engine? I would exchange the ignition module, just for kicks... also replace the spark plug wires and spark plugs, especially since you said they are old... again where did you check for spark?
Pulled cylinder 1 plug, put plug wire back on, ground it using the alternator bracket. Same with cylinder 2. Fuel pressure, I got a gauge and tested prime up and cranking. I should change the plugs and wires but I don't think that shut the car down, do you?
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Old Mar 13, 2010 | 04:23 PM
  #4  
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Re: 350 TPI Iroc No Start

is it a nice fat blue spark?are the plugs wet when you remove them?if you have good spark and good fuel may want to check for timing chai jumped.do a compression test yet?
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Old Mar 13, 2010 | 04:39 PM
  #5  
LS7Roc's Avatar
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Car: 88Roc Flame Red Black/Gold Pkg
Engine: L98
Transmission: 700R4
Re: 350 TPI Iroc No Start

It's running. Timing was off since I replaced pickup coil.
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Old Mar 13, 2010 | 04:47 PM
  #6  
KNBlazer's Avatar
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Joined: Feb 2010
Posts: 1,125
Likes: 1
From: San Diego, California
Car: Trailblazer EXT 4.2 (Firebird Form)
Engine: 5.1 4bbl
Transmission: 700R4 Mega Raptor Level 4
Axle/Gears: 2.73
Re: 350 TPI Iroc No Start

Originally Posted by LS7Roc
It's running. Timing was off since I replaced pickup coil.

Good to hear... make sure you take notes of everything you did, for future reference of course...
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Old Mar 14, 2010 | 11:15 AM
  #7  
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From: columbia s.c.
Car: camaro84.87iroc,91vert
Engine: Lt1, 383tpi,350tbi
Transmission: t56,T5,T5
Axle/Gears: 4thgenunknown,373,323?
Re: 350 TPI Iroc No Start

congrats to you..i changed pickup and still no spark....really aggravated now..........i mean none whatsoever
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Old Mar 14, 2010 | 12:11 PM
  #8  
KNBlazer's Avatar
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Joined: Feb 2010
Posts: 1,125
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From: San Diego, California
Car: Trailblazer EXT 4.2 (Firebird Form)
Engine: 5.1 4bbl
Transmission: 700R4 Mega Raptor Level 4
Axle/Gears: 2.73
Re: 350 TPI Iroc No Start

Originally Posted by irocwagon
congrats to you..i changed pickup and still no spark....really aggravated now..........i mean none whatsoever

A link to your thread would be helpful...
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Old Mar 14, 2010 | 12:38 PM
  #9  
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Re: 350 TPI Iroc No Start

have you tried checking for spark with set timing connector unplugged?i assume you checked for 12v at coil +? this would be really remote but have seen it and youve tried just about everythig else.poss. short on tach side of coil.this can be checked with test light across coil or see if coil is warm to touch after sitting with key on for maybe 20 mins.
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Old Mar 14, 2010 | 08:47 PM
  #10  
irocwagon's Avatar
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Joined: Oct 2005
Posts: 204
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From: columbia s.c.
Car: camaro84.87iroc,91vert
Engine: Lt1, 383tpi,350tbi
Transmission: t56,T5,T5
Axle/Gears: 4thgenunknown,373,323?
Re: 350 TPI Iroc No Start

timing connector???12v at coil is there......crank bolt loose now so tdc will be a prob tried tightning but only stays tight for about 4 turns....ls7 hows the car runnin..sorry for thread jackin
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Old Mar 14, 2010 | 10:42 PM
  #11  
LS7Roc's Avatar
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Car: 88Roc Flame Red Black/Gold Pkg
Engine: L98
Transmission: 700R4
Re: 350 TPI Iroc No Start

Originally Posted by irocwagon
timing connector???12v at coil is there......crank bolt loose now so tdc will be a prob tried tightning but only stays tight for about 4 turns....ls7 hows the car runnin..sorry for thread jackin
Car is running, haven't got a timing light yet so it runs a little rough. Maybe your crank bolt is stripped irocw..
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