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05-22-2013
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#1 |
 Join Date: Apr 2013
Location: Loudon NH 03307
Posts: 19
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Engine loses power when starting off.
My ZR1 runs good most of the time. This only happens once in while, when starting from a stop in first gear the engine stumbles, loses power and may back fire. After several seconds the engine regains power and is ok. This only happen when taking off and the car is up to temp. Any ideas would be appreciated.
Bob |
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05-22-2013
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#2 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Engine loses power when starting off.
my car is doing the same, I think its o2....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-22-2013
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Engine loses power when starting off.
As noted it may be the O2 heating up
I changed prom, ECM, etc still doing it....leaves the o2 I believe, someone with a tech 1 or scan tool should be able to ID the issue http://www.zr1.net/forum/showthread.php?t=20069
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-22-2013
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#4 |
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Join Date: Apr 2013
Location: Loudon NH 03307
Posts: 19
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Re: Engine loses power when starting off.
What is o2
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05-22-2013
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#5 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Engine loses power when starting off.
Oxygen sensor; its going bad, bad ground etc....confusing the ECM and altering fuel causaing a lean or rich condition
Laymans terms...a sensor that sniffs the exhaust, checks to see how rich or lean it is, then tells ecm to add or trim fuel
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 05-22-2013 at 12:22 PM. |
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05-22-2013
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#6 |
Join Date: Jan 2010
Location: Mystic CT
Posts: 2,633
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Re: Engine loses power when starting off.
Bob
We can check for any codes on Sunday D |
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05-22-2013
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#7 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Engine loses power when starting off.
mine does not throw a code when it happens, does yours?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-22-2013
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#8 |
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Join Date: Apr 2013
Location: Loudon NH 03307
Posts: 19
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Re: Engine loses power when starting off.
I have had it scanned several times in the past, but never while it was happening.
No error codes ever came up. This has happened since I bought the car 97. Care presently has 36k on it. I can go several weeks with no issues. |
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05-22-2013
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#9 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Engine loses power when starting off.
Mine does not show codes, I noticed a change in the 02 readings when it happens....I have not swapped mine yet but plan to do so...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-22-2013
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#10 |
 
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Engine loses power when starting off.
Lee,
I'm pretty sure my AutoXray gives dynamic TPS readings (just another thought). If so, we could see if the TPS isn't glitching - or any other sensor; O2 or whatever for that matter! P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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