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05-25-2013
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#1 |
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Join Date: Apr 2012
Location: Oviedo, FL
Posts: 12
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1990 ZR-1 cranks but won't start
Car is my daily driver. A couple months ago I was Leaving work one day tried to start it, would crank but not start. I had it towed to my*mechanic, they tried to start it, but same issue.
They pushed it into their bay, set it up for diagnostics and then it started right up and every time after that. Yesterday the issue came back. was out to lunch and when done the car would crank but not start. I got a ride back to the office and end of the day back to my car. It started right up. Any ideas on what would cause this? Thanks, Sam |
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05-25-2013
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#2 |
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Join Date: Feb 2011
Location: Salinas, Ca
Posts: 159
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Re: 1990 ZR-1 cranks but won't start
I had a s10 blazer that would do the same thing. Ended up being the fuel pump, it was border line on fuel pressure. Would start with 40 psi or above but at 39 psi or below it was a no start.
Good luck. |
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05-26-2013
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#3 |
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,193
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Re: 1990 ZR-1 cranks but won't start
Likely primary fuel but strange because even if the engine is warm the secondary pump should allow for a start then quickly you should stall because it shuts down (by design) and the primary is left to supply fuel. The fact that it starts ok when cold also points to primary fuel pump because when cold both pumps run.
You need to attach a fuel pressure gauge then warm it up and watch.
__________________
Scott  Vett owner since 1979._It's about the car and the people |
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05-26-2013
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#4 |
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Join Date: Apr 2012
Location: Oviedo, FL
Posts: 12
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Re: 1990 ZR-1 cranks but won't start
I don't think it has to do with being cold. The first time it has the issue was after sitting in the parking lot at work the entire day.
I left it there over night, went back the next day and it still would not start. That's when I had it towed, didn't start for the mechanic until after pushing it into his bay. |
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05-29-2013
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#5 |
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Join Date: May 2013
Location: Nor Cal
Posts: 8
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Re: 1990 ZR-1 cranks but won't start
Could be a temperamental ckp, as stated above though I would check fuel pressure first, had the same problem with a car I was messing with, it would run perfect, then all of a sudden try to start it again and no start, hooked up my laptop and noticed no rpm signal on cranking, replaces the sensor and it's been good ever since
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05-29-2013
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#6 | |
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Join Date: Dec 2012
Location: NC
Posts: 1,783
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Re: 1990 ZR-1 cranks but won't start
Quote:
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05-29-2013
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#7 |
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Join Date: May 2013
Location: Nor Cal
Posts: 8
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Re: 1990 ZR-1 cranks but won't start
Also, bring a spark plug with you if your daily driving the car still, when it happens pull one wire and check if it's got spark, if it does that immediately cancels out the ckp in theory because that is what is the trigger for the ignition system on these engines iirc
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05-29-2013
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#8 | |
 Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,271
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Re: 1990 ZR-1 cranks but won't start
Quote:
Welcome! peace Hog |
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06-25-2013
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#9 |
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Join Date: Apr 2012
Location: Oviedo, FL
Posts: 12
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Re: 1990 ZR-1 cranks but won't start
I had the issue again over the weekend. I had a code reader with me this time and it was code 21 Throttle Position Sensor high. Does this sound like something that would cause this issue? Makes sense if it thinks the car is at full Throttle not to start?
Thanks, Sam |
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06-25-2013
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#10 |
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Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,193
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Re: 1990 ZR-1 cranks but won't start
The FSM makes no mention of a "no start" if TPS is stuck high.
Dunno......
__________________
Scott Vett owner since 1979._It's about the car and the people |
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