12secondv6
05-01-2007, 05:24 PM
Well, the fiance has a 2002 Hyundai Elantra 4 cyl automatic
It has approx 110,000 miles.
Pre-me.... the car was unfortunately not maintained very well. Since I have come into the picture I have done a full tune up and fluid change etc and the car has been running great. Getting over 30 mpg..... running nice and smooth etc.
About 1 month ago I would notice that after driving approx 30 minutes when I would come to a stop the car would have a slight miss or run slightly rough at idle. At first I kinda dismissed it as bad gas.... maybe even fuel system needed cleaning.
I added some injector cleaner and continued driving.
Over the past month it has become worse.
I noticed that when I come to a stop and raise the rpm's to about 1,500 everything would be fine and no miss/ run rough.
At this point....NO check engine lights!
So... a week ago genie and I were cruising along the highway doing 75 ish, A/C on and going up a long hill and the car lost power and check engine light blinked a couple times. I let off the gas, moved over to the slow lane and the check engine light went out and the car was fine. This happened for a maximum of 5 seconds at best.
Today I popped off the intake and began cleaning the TB and intake manifold with both TB cleaner and also mass air flow sensor cleaner.
I drove the car a little bit later and it ran GREAT! The idle issue was gone, it felt much peppier.
After about an hour of driving around town and also sitting idling in the driveway for another hour the idle issue came back.
I let the car cool down for a while and continued to inspect/ clean the TB and intake. It was frigin black as hell in there and each time I used a rag in there it came out covered in carbon build up.
I just went for a drive and the idle issue came back and then the loss of power/ flashing check engine light came back. Shortly after (maybe 5 seconds) the check engine light went out.
What do you think it is??
I already have a suggestion of doing that sea foam stuff.
http://www.seafoamsales.com/motorTuneUpConsumer.htm
Any other suggestions? Could it be the maf?
Granted.... I have never seen such a huge amount of carbon build up in a TB n intake before....
It has approx 110,000 miles.
Pre-me.... the car was unfortunately not maintained very well. Since I have come into the picture I have done a full tune up and fluid change etc and the car has been running great. Getting over 30 mpg..... running nice and smooth etc.
About 1 month ago I would notice that after driving approx 30 minutes when I would come to a stop the car would have a slight miss or run slightly rough at idle. At first I kinda dismissed it as bad gas.... maybe even fuel system needed cleaning.
I added some injector cleaner and continued driving.
Over the past month it has become worse.
I noticed that when I come to a stop and raise the rpm's to about 1,500 everything would be fine and no miss/ run rough.
At this point....NO check engine lights!
So... a week ago genie and I were cruising along the highway doing 75 ish, A/C on and going up a long hill and the car lost power and check engine light blinked a couple times. I let off the gas, moved over to the slow lane and the check engine light went out and the car was fine. This happened for a maximum of 5 seconds at best.
Today I popped off the intake and began cleaning the TB and intake manifold with both TB cleaner and also mass air flow sensor cleaner.
I drove the car a little bit later and it ran GREAT! The idle issue was gone, it felt much peppier.
After about an hour of driving around town and also sitting idling in the driveway for another hour the idle issue came back.
I let the car cool down for a while and continued to inspect/ clean the TB and intake. It was frigin black as hell in there and each time I used a rag in there it came out covered in carbon build up.
I just went for a drive and the idle issue came back and then the loss of power/ flashing check engine light came back. Shortly after (maybe 5 seconds) the check engine light went out.
What do you think it is??
I already have a suggestion of doing that sea foam stuff.
http://www.seafoamsales.com/motorTuneUpConsumer.htm
Any other suggestions? Could it be the maf?
Granted.... I have never seen such a huge amount of carbon build up in a TB n intake before....