I think my car is running lean!?

AaRoN

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So it runs fine until it warms up. Then is starts to spit and sputter when i'm cruising at a steady speed but if im accelerating it's fine. I'm lost as to why it's doing this. I noticed it after i washed the engine bay. it's totally fine (warm or cold) when it's just idleing. my a/f (although it is just the autometer lightshow) it stays towards the lean side when i'm cruising. any ideas?
 

quickstang_1994

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Before operating temp it runs off a set mode not the sensors. You might want to clean the maf while you are there. I wash my S281 and it did the samething and it took me a while to realize that water got pass the boots on the spark plugs.
 

Whistler98

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Yeah I bet you just got water passed the boots. You have to be careful when spraying off the motor. When I changed my intake I got coolant everwhere, starter up and it was fine then it started missing and stuff. Here I just didn't get all the water outta the spark plugs. blu them out with compressed air and had a nice green fog comin outta there, ran fine after that. I would just pull the boots and blow them out hopefully that will fix your probs.
 
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AaRoN

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i used a shop vac to clean out what i could. but the spark plugs (only a month old) were black when i pulled them but the passenger side ones were almost brand new looking :dunno: i put new plugs on the driver's side and it still has a little bit of a "miss" when it's at operating temp but not all the time now. ;i am totally stumped now :dunno:
 

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