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Had a recent problem with check engine light. The code given was p0171, "bank one running lean". The car had a loping idle and hesitated every time i got on the throttle. I couldn't figure out the problem and neither could any mechanics so i drove it for a few months with the CEL on. Recently...

yeah, p0171 has been the only code shown... The engine doesn't sound bad, i can hear it spool, boost blow off. The only thing i can think of is that a vacuum is occluded or there is a valve malfunction somewhere. It seems to be an issue of vacuum pressure when returning to idle. Just a few...

i don't have a boost or vac gauage.... I changed out my spark plugs, but i haven't changed out my pvc... i'll give those a shot and try to get the vac read... what is normal vac range anyway???

The car has a bit of a loping idle, it occasionally stalls when the load is removed from the motor. Also, it gets a hard hesitation whenever the i get on it. I went through and cleaned the MAF, EGR, Throttle Body and Changed the air filter. I also went through and did the brake cleaner around...

what's normal tps range for a 2003 mazdaspeed protege??? I still haven't figured the P0171 code. My idle is around 700 and the tps range is around 10... just wondering if those number are out of the ordinary.

i'll give those ideas a shot but, the bad idle isn't consistent. It will only do it once in a while. The "near stalls" only occur while driving. The other thing is. It will go a few days with the CEL on, then CEL shuts off for a few days.Makes it kinda hard to catch the problem. I'll let you...

it's got 63k. already sprayed down the throttle body down with cleaner, still no change. I had also just recently changed out the spark plugs. Only suggestion one of my friends could make is that my air idle valve was malfunctioning or getting suck. Ever heard of this happening? I was going to...

Just a while back my MSP thew a CEL. My idle became inconsistently erratic and RPM's would drop to zero if i took the load off the engine too fast while driving. Took it to have the code read by a friend who had a reader and it gave P0171(bank 1 too lean). I heard i was a common problem so, i...