Engine stumble only at 1500rpms
#1
Intermediate
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Engine stumble only at 1500rpms
What could cause this? I have 100k and I only notice this if in park or neutral at 1500rpms. It goes away before and after and it seems to drive very smoothly. I had a bad alternator and I just replaced it but the "new" one is making a high pitching ringing so I'm having the shop change that out for a new oem. Any chance it's the alternator or could this be something else. I have sea foamed the throttle body recently and cleaned the maf recently and changed the air filter. I didn't do plugs but they are do at 120k
#3
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update, I went ahead and changed the plugs tonight. it improved the stumble by 60-70%. It was fairly noticeable and now its faint. I still notice it (i guess because I'm looking for it). I noticed that two plugs on the driver and passenger side closest to the firewall had a little oil on the threads. I also noticed that two plugs (one on each side) were barely hand tight, loose actually. Anyway, the only other thing I can think of is that maybe the MAF sense has a "flat" spot in it or something? Or maybe as it it gets older, cleaning it can only do so much? Either way, I'm open to more suggestions. Thanks.
#7
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yes, thank you, I should have mentioned that was one of the first things I did. Here is an update though, if I am not just imagining this, the vibration seems to have gone away after I just installed the secondary air pump bypass and installed the block off plates. It was still doing it after the initial electronic bypass, but it seems to have disappeared now for the moment since I put those plates on. I wonder if/how that could be connected?
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#8
yes, thank you, I should have mentioned that was one of the first things I did. Here is an update though, if I am not just imagining this, the vibration seems to have gone away after I just installed the secondary air pump bypass and installed the block off plates. It was still doing it after the initial electronic bypass, but it seems to have disappeared now for the moment since I put those plates on. I wonder if/how that could be connected?
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