1997 LeSabre - CYLINDER 6 MISFIRE - bucking, under load, etc - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-22-2008, 07:30 PM   #1
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Default 1997 LeSabre - CYLINDER 6 MISFIRE - bucking, under load, etc

1997 LeSabre with a 3800 SII non-supercharged

just did the LIM gaskets, Dorman upper plenum and everything that goes with (fuel injector o-rings, pcv, etc. ) plugs (NGK TR55IX) wires (Delco) and a coolant flush/replacement with new hoses/thermostat, etc. Used green coolant and flushed out the orange. 180 degree thermostat. I also had to replace the coolant temp sensor because I accidentally broke the old one by dropping the manifold on it (durrr...)

WHAT THE CAR IS *NOT* DOING:

-starting hard (fires right up)
-idling funny (purrs like a kitten)
-overheating (temp is perfect
-smoking or having any weird stuff out the tailpipe

WHAT THE CAR IS DOING:

-running a bit rough under anything more than slight throttle
-bucking just a bit (not violently) under harder throttle. It'* more like shaking a bit under throttle than real bucking.
-occasionally get a *pop* out of the exhaust when it'* bucking/shaking.

It threw a CEL, and the computer at the Checker said #6 had a misfire detected.

I made sure that the fuel injector was plugged in, firmly seated in it'* bucket, and I tried a new plug and made sure the wire was attached properly. It seems to be fine at idle. Purrs nicely at idle, but if you remove wire #6 the idle turns to crap, so I think there'* fuel and spark. It cetainly acts like there'* a 1-cylinder miss at throttle though.

Is it possible that injector #6 went bad while it was out of the car?

Help is appreciated, as ever!
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Old 03-22-2008, 10:46 PM   #2
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have you checked to see if is the plug wire hitting the 02 or 02 Wires by chance, i just fixed a GTP with a p0306 yesterday, with the same symptoms
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Old 03-23-2008, 12:59 AM   #3
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It isn't.

For some reason, none of the wire clips are present on this car. Whoever installed the last set of plug wires used zip-ties. Still, nothing'* hitting anything it shouldn't or anything odd like that.

I've got spark to the plug.
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Old 03-23-2008, 01:43 AM   #4
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If you suspect a bad injector on cyl 6, try swapping it with another cyl to see if the problem follows.

A misfire like this can be a symptom of coolant ingestion. I know you said you just did the UIM / LIM stuff...are you absolutely certain that every bolt was torqued down properly? Did you install the TB gasket (it'* been forgotten by more than one of us )? Is your coolant level in the overflow now steady?
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Old 03-23-2008, 01:59 AM   #5
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Derp. I had the throttle body gasket installed...yes...but the top nut was worked loose and I had a massive air leak.

Dar Dar Dar I'm a tard. Thanks for the help everybody, much obliged to ya
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