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2000 Montana, 3.4 SFI.
Engine may have a slight miss at idle, but if so it's hard to tell. At 1400-1900 RPM the miss it quite noticeable. Anything above 2000 RPM is smooth.
I did a head gasket/ intake gasket / other gaskets job last spring and all went well. I also replaced the timing chain & guide, harmonic balancer, plugs, wires, coils, had the heads resurfaced and new valve springs... That's about it I think.
Anyway, it was running fantastic with MUCH power for several months. Then it developed this issue slowly, then leveled off.
I checked my coil spark and had a weak one so I replaced the set. Still happens. Also checked plugs, wires, vacuum leaks, etc.
Then I read in one of the forum posts here (and googled info about this that included other brand vehicles with same issue) about the damage an aftermarket oiled/permanent filter can cause to the MAF and that this can make a vehicle run this way.
Now that i think of it, it wasn't long after I installed one of these air filters for better performance that this issue began.
Could this actually be the cause?! I assume that if so, I can clean the MAF and replace the filter with a decent paper filter and this should go away. Or have I caused enough damage that the MAF needs replacement?
What's your opinion on this?
Engine may have a slight miss at idle, but if so it's hard to tell. At 1400-1900 RPM the miss it quite noticeable. Anything above 2000 RPM is smooth.
I did a head gasket/ intake gasket / other gaskets job last spring and all went well. I also replaced the timing chain & guide, harmonic balancer, plugs, wires, coils, had the heads resurfaced and new valve springs... That's about it I think.
Anyway, it was running fantastic with MUCH power for several months. Then it developed this issue slowly, then leveled off.
I checked my coil spark and had a weak one so I replaced the set. Still happens. Also checked plugs, wires, vacuum leaks, etc.
Then I read in one of the forum posts here (and googled info about this that included other brand vehicles with same issue) about the damage an aftermarket oiled/permanent filter can cause to the MAF and that this can make a vehicle run this way.
Now that i think of it, it wasn't long after I installed one of these air filters for better performance that this issue began.
Could this actually be the cause?! I assume that if so, I can clean the MAF and replace the filter with a decent paper filter and this should go away. Or have I caused enough damage that the MAF needs replacement?
What's your opinion on this?
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