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

Re: Engine loses power when starting off.
 

my car is doing the same, I think its o2....

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

Re: Engine loses power when starting off.
 

What is o2

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

Re: Engine loses power when starting off.
 

Bob
We can check for any codes on Sunday
D

Re: Engine loses power when starting off.
 

mine does not throw a code when it happens, does yours?

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.

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...

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.