I took my car in about a month ago to get my whole cooling system fixed, new hoses etc... Anyway when i got it back the "Check Engine" warning light was on. The mechanic (Goodyear Tyre n Auto) said that they probably got water on one of the sensors and was causing an open circuit and should go away once it dries up... this never happened, and after about 2 weeks i figured it was probably just a faulty wire.

Anyway!..... I took it back in just yesterday cause it was pissing me off and after 45 minutes of trying to figure out the computer tester we found that the air flow sensor wasnt plugged in all this time.
I noticed that after i got the car back that it was running ineffeciently and bad iddling.

My question is.. It was running without the sensor plugged in for over a month now, is that terribly bad for the car? What affects does it have or anything.. I dont know much in this department :?

Hard to beleive 'trained proffessionals" could make a mistake like this aye.. idiots.


Thanks

The car would likely have been running very rich for the period of time that the MAF was unplugged; You may need to replace the spark plugs as it is quite possible they would be fouled. After a day or two of regular driving the ECU will retune itself to the presence of the MAF but there is unlikely to be any damage caused to the engine.

i just did that today... had to take the MAS off...
anyways i forgot to put it back on and when i started the car, the idling was continuously revving up and down... had no clue what was happening...so went for a drive and the check engine was on..
so i opened the boot and found out that i didnt plug in the wires to the MAS...
was shitting myself... ;)

anyways thats my experience...

so i opened the boot and found out that i didnt plug in the wires to the MAS...
was shitting myself... ;)

Well i am shitting myself if you had to open the boot to plug in the MAS -maybe thats why you can't get your amp to power your sub!!

Manual

I guess its feasable that since the mixtures may have been wrong and the engine running rich that the CAT could be affected in some way as well?

People do this all the time and i was told by the mitsu service contact that the ecu will adjust itself shortly.

The best thing to do is reboot the ecu and from memory thats just a matter of disconnecting your batter terminal over night. Don't quote me on this one though. This is thinking a while back.

Cat will be fine.
Plugs, depending on how old should clean them selves in time, std plugs are designed to last about 40000 however in older engines will usually change more often
Typical Good year lol
The ecu will re learn after a while either that or disconnect the battery for a while, overnight is good then start the car and idle for about 20 mins

Could you elaborate pls:

Mitsu claims that if mixtures are incorrect the Cat suffers. Or does it only apply when it is too LEAN?

Isn't overnight too long? I have heard 20 min disconnection periods?
Why run idle 20 min? Can't you just drive on?

Thanks


Cat will be fine.
--- or disconnect the battery for a while, overnight is good then start the car and idle for about 20 mins