Engine loses power when starting off.

[Bob Lyle]

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

[LGAFF]

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

[LGAFF]

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

[Bob Lyle]

What is o2

[LGAFF]

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

[Mystic ZR-1]

Bob
We can check for any codes on Sunday
D

[Dynomite]

Originally Posted by LGAFF

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

I am assuming the individual o2 sensors (RH and LH) control individual (sets of 8) injector fueling (RH Bank of Injectors and LH Bank of Injectors) through the ECM.

And by extension the ONLY individual Bank (RH 4 cylinders or LH 4 cylinders) control feature since the Secondaries on both banks are controlled as a unit (excluding the mechanical failure of one Bank of Secondaries). The ignition (spark) is controlled as pairs (one each side). The RH and LH bank Fuel Pressures are tied together through the Pressure regulator on the Fuel Rails.

The Reason I bring this up now............a Question directly related to the function of the o2 sensors as individual sensors and individual control of Cylinder Bank (4 cylinders each Bank) Fueling came up on CF.

[Bob Lyle]

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.

[LGAFF]

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...

[Paul Workman]

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.