Hello,
I’ve been reading through some older threads, but wanted to make an inquiry.
06 expy, 180,000 miles. 2nd owner, always well maintained. Have put significant highway miles (~15k) towing ~5,000 lb trailer last few years.
Recently, I noticed what I initially thought was a small exhaust leak.
Popping sound when giving it gas, under load, at ~1500-2,500 rpm. Difficult to duplicate and isolate sound when not driving.
I considered a misfire, but it’s not throwing any codes or check engine light.
Had a mechanic look at it and he thought it was possibly a bad coil. He “power braked” it and was able to replicate the sound in the garage.
He recommended changing all the coils. Which, based on all the threads I’ve been reading, seems like overkill.
I would like to go ahead and get the plugs changed. Not sure if the original plugs were changed at 90 or 100k, but figure it’s about time.
I have had an issue previously years ago with one of the coil connections getting loose. At that time the engine light came on and the car went into limp mode. Played around with and cleaned the connections resolved the issue.
Owing to that experience I’m wondering if the “popping” sound is even related to ignition.
Definitely sounds like an issue with a single cylinder, but not loud enough to be an exhaust manifold leak.
Any thoughts are appreciated.
I’ve been reading through some older threads, but wanted to make an inquiry.
06 expy, 180,000 miles. 2nd owner, always well maintained. Have put significant highway miles (~15k) towing ~5,000 lb trailer last few years.
Recently, I noticed what I initially thought was a small exhaust leak.
Popping sound when giving it gas, under load, at ~1500-2,500 rpm. Difficult to duplicate and isolate sound when not driving.
I considered a misfire, but it’s not throwing any codes or check engine light.
Had a mechanic look at it and he thought it was possibly a bad coil. He “power braked” it and was able to replicate the sound in the garage.
He recommended changing all the coils. Which, based on all the threads I’ve been reading, seems like overkill.
I would like to go ahead and get the plugs changed. Not sure if the original plugs were changed at 90 or 100k, but figure it’s about time.
I have had an issue previously years ago with one of the coil connections getting loose. At that time the engine light came on and the car went into limp mode. Played around with and cleaned the connections resolved the issue.
Owing to that experience I’m wondering if the “popping” sound is even related to ignition.
Definitely sounds like an issue with a single cylinder, but not loud enough to be an exhaust manifold leak.
Any thoughts are appreciated.