Hi all, I have a 2006 Pontiac torrent that has been occasionally having a very rough start. It sounds like an explosion in the engine and then after starting I typically hear a couple popping noises. Due to this I had changed out the spark plugs and wires, as I thought it might be a spark plug not …

It sounds like the timing is off. Is the check engine light on?

[image] Ben-Zaleschuk: .It hasn’t activated a check engine light, No. Tester

No check engine light. I believe the last one was for the EGR and I had replaced it.

Should also mention that I was having flooding issues prior to changing the plugs. Had to typically give it some gas to start periodically, but the issue has gone away since changing the plugs and wires

Remove the oil dip stick and sniff if the oil is contaminated with gas. Tester

I tried that as well. The oil seems fine. No real smell of gas. That’s why I’m pretty stumped on this one.

I only run synthetic, so it’s usually that sweet oil smell. Also just changed it about 1k km ago though

06 torrent has 3400 v6. They have plastic ribbed intake plenum gaskets that fail due to heat cycles. Maybe you have changed them? A failure can cause vacuum leaks and burning coolant which could cause a rough idle. Next is bad headgaskets which fail in a slow gradual decline in motor performance.

It could be the head gasket actually. The last mechanic I took it to about 15k ago said it had a really slow leak. Haven’t noticed a huge reduction in oil at changes though. Coolant level has also been consistent for the last year, so that isn’t a concern to me. I haven’t smelled the burning coolan…

2006 Pontiac torrent Rough Start & Popping Noise

Maintenance/Repairs

Ben-Zaleschuk May 20, 2020, 11:02pm 11

So just an update. Took it into a mechanic and they still weren’t able to diagnose the issue. They tested the fuel pressure, spark, cleaned the MAF. They did a Terraclean fuel service to Decarbonize the system, so hoping that solves the issue.

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2006 Pontiac torrent Rough Start & Popping Noise

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