2002 Cavalier 2.2 Sfi Idle problems/Missfire 105000 KMS on car


Muttttly
03-17-2017, 01:35 AM
Hello everybody been fighting this problem for months now,easier to explain what I haven't done ,only gets a code when idling for a while in closed loop,sometimes ,po 300 most of time it jumps differrent cylinders rough idle, excellerates​ without issues,Starts great,I have replaced and checked vaccum lines etc Ok what I haven't done.
Have not checked fuel pressure,crank,can,knock, sensor hasn't been changed,rear ,02 sensor not replaced and ecu not changed yet.Everything else done literally..thanks

Blue Bowtie
03-17-2017, 10:29 PM
You named it - Fuel pressure. Test that with KOEO and while running.

Muttttly
03-27-2017, 10:49 PM
Internal leak of the intake manifold.
In case someone reads this.

Blue Bowtie
03-29-2017, 07:41 AM
Internal leak? Care to elaborate? I thought the intake was still aluminum in 2002.

Muttttly
03-29-2017, 07:02 PM
Internal leak? Care to elaborate? I thought the intake was still aluminum in 2002.

I have the 2.2 Sfi ....plastic intake manifold

Blue Bowtie
03-29-2017, 07:51 PM
I have a '96 2.2 SFI, and it was still aluminum then. I wasn't sure when they switched.

Muttttly
04-11-2017, 11:10 PM
I have a '96 2.2 SFI, and it was still aluminum then. I wasn't sure when they switched.

You must have a two piece manifold,As for mine yes the plastic one and it's warped causing a internal leak.

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