strange idle issue - any ideas?
#1
strange idle issue - any ideas?
04 with 21k miles, just started doing this wierd thing sporatically where im sitting at a light and the car goes up and down in idling.. revs up juuuust a tad, then almost seems like its going to choke down, but comes back up to the tad high rev, then back down.. it does it over and over.. almost seems its going to cut off, but then picks back up and compensates quickly with a higher idle, then holds it for a second then goes back down to almost cuting off. its like one second high, then conk for a second, then up a second, ten down. it will just sit there and do that until i hit the gas a little, or take off. literally about a secon on the higher idle hold, and the almost choking low...No loss in power when I take off, no skipping,.. drives find outside of the odd idling when still.. it started when i had ~1/4 tank left, so i thought it might be some bad gas, but ive filled up twice now and it still happens.. probably just twice in the last 200 miles, but its still odd.
shes due for an oil change now so Ill run it by the dealer, but would love to have a little ammo on the situation when i go in there..
o yeah no CEL at all..
thanks for any help
Jason
shes due for an oil change now so Ill run it by the dealer, but would love to have a little ammo on the situation when i go in there..
o yeah no CEL at all..
thanks for any help
Jason
#4
NT Rotorhead
Join Date: Aug 2003
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Mine does this too. I have an aftermarket exhaust and headers on, and ever since I reset the ECU, this has been happening. No idea what is going on - the ECU is a strange beast and does some weird **** at times.
#5
Zoom-Freakin'-Zoom
iTrader: (5)
Originally Posted by Wildcard
Mine does this too. I have an aftermarket exhaust and headers on, and ever since I reset the ECU, this has been happening. No idea what is going on - the ECU is a strange beast and does some weird **** at times.
beers
#6
Hum, Im not familiar with rotary engines, but it sounds liek it is a fuel mixture problem. I know a piston engine can do this with a bad mass air flow sensor, untill the ecu replaces the values with preset ones to save the cats. That or the o2 sensor is giving false readings, but that doesnt happen very often.
A vacume leak would be consistent, and since it is more intermitent thats probably not your problem.
PLEASE post the results after going to the dealer, Im curious to know what happened
Thanks
A vacume leak would be consistent, and since it is more intermitent thats probably not your problem.
PLEASE post the results after going to the dealer, Im curious to know what happened
Thanks
#7
Originally Posted by 66Racer
Hum, Im not familiar with rotary engines, but it sounds liek it is a fuel mixture problem. I know a piston engine can do this with a bad mass air flow sensor, untill the ecu replaces the values with preset ones to save the cats. That or the o2 sensor is giving false readings, but that doesnt happen very often.
A vacume leak would be consistent, and since it is more intermitent thats probably not your problem.
PLEASE post the results after going to the dealer, Im curious to know what happened
Thanks
A vacume leak would be consistent, and since it is more intermitent thats probably not your problem.
PLEASE post the results after going to the dealer, Im curious to know what happened
Thanks
#10
I've got an '04 MT and it has done the same thing to me but only when the engine hasn't quite reached operating temperature. By that I mean, normal operating temperature has been indicated on the temp gauge for about 3 - 5 minutes. Once the engine is completely warmed up, the problem disappears.
Is this similar to your experience?
Is this similar to your experience?
#11
Administrator
dirty MAF will cause eratic idle. so will a malfunction neutral switch. if the car doesnt know its in neutral (or clutch depressed) the pcm doesnt have the necessary input to idle correctly. there is a switch on the tranny which has been known to stick. i recently had a fellow 8 owner ove rthe house. they had erratic idle. checked with the hymee and they had a pending code for low volt on the MAF circuit. cleaned the maf and cleared the pending- right as rain
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