1995 Chevrolet Camaro No start

Tiny
WILE E
  • MEMBER
  • 1995 CHEVROLET CAMARO
  • 5.7L
  • V8
  • RWD
  • MANUAL
  • 130,000 MILES
No start situation. (Note* I am a 40 year veteran in the automotive trade)

Fuel pressure 45 lbs and holding steady. (Fuel pump replaced recently due to freeze up failure)
Good injection pulse on all injectors (checked with noid light).
Good spray from all injectors (standard check with strobe light)
Good spark from all cyls. (Nice blue and hot gapped to.50)
Compression 150 to 155 lbs across
All back tracing voltages correct including the icm and coli harness.
vats system has been bypassed with correct resistor (plus vehicle would not turn over if there was a failure)
No start with carb spray directly into intake.
No codes present ( dug out my old mt2500 brick for this one. Had to make a harness to connect obdll outlet to obd1 connector. Another great GM idea, put an obdl system with an obdll plug).

Any ideas?
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Tuesday, May 20th, 2014 AT 10:37 AM

19 Replies

Tiny
WRENCHTECH
  • EXPERT
96 was the transition year so you have a hybrid setup. What do the plugs look like when you take them out?
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Tuesday, May 20th, 2014 AT 11:28 AM
Tiny
WILE E
  • MEMBER
Plugs were slightly wet due to the no start. Were dried and reinstalled.
Brand new btw.
Also for further information forgot to mention that the cat was checked for blockage and is clear.
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Tuesday, May 20th, 2014 AT 11:32 AM
Tiny
WRENCHTECH
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I'd put a scanner on it cold before running it and see if the coolant and air temp sensors match.
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Tuesday, May 20th, 2014 AT 12:32 PM
Tiny
WILE E
  • MEMBER
No start, not a problem of being warm.
Was checked for a cold start situation as well.
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Tuesday, May 20th, 2014 AT 12:35 PM
Tiny
WRENCHTECH
  • EXPERT
How do you know that?
If the CTS is open circuit the computer will think it is -40 degrees and supply fuel accordingly.
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Tuesday, May 20th, 2014 AT 1:49 PM
Tiny
WILE E
  • MEMBER
Go to first post.
It was scanned and checked.
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Tuesday, May 20th, 2014 AT 2:47 PM
Tiny
WRENCHTECH
  • EXPERT
I don't see anywhere that you checked the values of the temp sensors. You might think you are on top of everything here but obviously you are not because it doesn't run. You need to look at data when cold and compare the ECT and ait readings. They should be the same.
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Tuesday, May 20th, 2014 AT 3:03 PM
Tiny
WILE E
  • MEMBER
Did, I assumed you would get that when scanner was hooked up. One doesn't hook up a scanner and do not check peripherals.
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Tuesday, May 20th, 2014 AT 4:18 PM
Tiny
WRENCHTECH
  • EXPERT
No, I wouldn't assume that at all. I'm afraid there has to be a problem with your testing somewhere. If everything you have stated was 100% true, the car would be running. There has to be something wrong with the testing.
If the plugs are fouling, then you obviously have either too much fuel or not enough spark. The only way you are going to get too much fuel is either leaking injectors which you state it holds rest pressure or intentional richening due to incorrect temp input.
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Tuesday, May 20th, 2014 AT 5:13 PM
Tiny
WILE E
  • MEMBER
Re-did all tests except for removing fuel rail to check spray pattern.
Bought some fresh crc carb clean from napa.
Sprayed while apprentice tried to start.
Finally something. Backfire. Timing must be out severely.
Pulling opti-spark system as we speak to see which type it requires.
After I get a new puller since mine grew legs and walked out of the *insert profanities here* shop.
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Wednesday, May 21st, 2014 AT 11:04 AM
Tiny
WRENCHTECH
  • EXPERT
The backfire could have been timing or even lean mixture. You might want to check that spark again and see just how strong it is using an adjustable spark tester. The fact that is wasn't backfiring before tends to indicate lack of fuel among other things
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Wednesday, May 21st, 2014 AT 11:33 AM
Tiny
WRENCHTECH
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Just a thought. Is this an opti-spark system? It didn't get wet, did it?
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Wednesday, May 21st, 2014 AT 11:34 AM
Tiny
WILE E
  • MEMBER
It is an opti spark. Posted earlier as well. Possibly has been wet unkown as of yet. All v8's in the camaro of that year are opti sparks. Aka the LT1
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Wednesday, May 21st, 2014 AT 4:32 PM
Tiny
WRENCHTECH
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Yes, there is only one V8 available for that year Camaro.
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Wednesday, May 21st, 2014 AT 4:36 PM
Tiny
WILE E
  • MEMBER
Completely soaked in oil on the top side. Wear on the plug to opti spark system, possibly from harmonic balancer. E4 thin wall deep socket also grew legs for amount of use. Virtually none in ten years except for a couple of air bags.
Will let you know the results when stripped down, but I am banking on the opti being FUBAR bigtime.

Already ordered seal for water pump driver since it was thrashed upon inspection.
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Thursday, May 22nd, 2014 AT 1:20 PM
Tiny
WRENCHTECH
  • EXPERT
Sounds like you're getting close
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Thursday, May 22nd, 2014 AT 2:45 PM
Tiny
WILE E
  • MEMBER
Finally got all parts in. Takes a while in butt frack nowhere.
Running now like a Swiss watch. Optispark system was the failure.
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Monday, June 9th, 2014 AT 12:20 PM
Tiny
WRENCHTECH
  • EXPERT
Glad to hear that
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Monday, June 9th, 2014 AT 12:29 PM
Tiny
WILE E
  • MEMBER
To all you diyers and other techs, just because my customer's problem was the opti spark system, do not assume it will be the correct answer all the time.
Do all your checks first to eliminate other problems first. ;)
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+1
Tuesday, June 10th, 2014 AT 2:00 PM

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