makaveli3004

I have the auto 5th gen. The muffler b pipe bhad cracked apart from the muffler for a about 3 months. I stopped driving the car. About 2 days ago I got it fixed at meinike they put in a new pipe and welded it. When i drove it on the highway it wouldnt shift I would hit 4000 rpms and it would stay there and i would be doin about 40mph if i came down to 3000rpms it would shift and then I could get up to about 80 mph but then it would stick at 4000 rpms again and slowly die down. whats wrong with this. Also now even when in park and i rev the engine it gets to 3000 rpms and starts tp die down. The car was fine 2 days ago before the exhaust got welded. Could this be the problem?

jasonmax

iTrader: (2)

O2 sensors?

makaveli3004

could that be the problem? the check engine light is off now but when Im driving and I hit about 70mph and I put the pedal to the floor the check engine like will flash

Merlyn

iTrader: (4)

Flashing CEL means Multiple Misfires (Class A). Even though it is at 4k RPM, I would still check your MAF just to make sure it is plugged in. Flashing CEL means that the car is detecting multiple misfires.

wyche89

MAF?

Merlyn

iTrader: (4)

MAF - Mass Airflow Sensor (well.. technically Mass Airflow).

A mass airflow sensor is used to determine the mass of air entering an electronically fuel-injected engine. The air mass information is necessary for the engine control unit to calculate and deliver the correct fuel mass to the engine.

Bad MAF in our cars will prevent you from driving above 2500 RPM... 4k is rather far away, but still is not out of question in terms of bad tac gauge (as mine is about 500 off). Figured I would throw it in there as the (man I wish I would have checked that before I replaced $1000 worth of things)

makaveli3004

yess deff well mine will rev out to 4000 and then shift really hard after a minute or so

jvienneau

Are you sure it's not the "OD off" light that's flashing?

makaveli3004

meinike told me i need two new 02 sensors in the rear and a new catilytic convertor. Total about $918

upstatemax

iTrader: (15)

o2 sensors should not do that... I had all four of mine disconnected for nearly a month and I never had a problem, just a CEL and the car goes into "safe mode".

I would think it's your TCM (Transmission Control Module).

carsarecool

iTrader: (1)

+1 ^^ O2's wont affect driveability nor will they make the SES flash, MAF wont make it flash either, like he said though it will limit RPM's. You can get a better price on the cat and O2's, dont pay 1000 bucks to have that replaced unless you've got it and just want to get it done and over with. anotehr +1 on the O/D off light, I've heard thats basically the transmissions version of the check engine light

makaveli3004

No the OD light never came on. Also the CEL light only flashed once i was close to 75mph. but only once. I brought it to meinike had it tested and now the check engine light is constantly on. they told me there was numours codes....that the catalyitc convertor was clogged an that it was saying that the o2 sensors in the back were shot it was tellin the enigine the wrong fuel ratio and that thats the reason I cantgo over 4000 rpms anymore.

upstatemax

iTrader: (15)

The rear o2 sensors have nothing to do with the fuel maps. That's the job of the front (primary) o2 sensors, the rears are there to check if the cats are working.

As I said before, the car just goes into a safe mode and runs rich if it can't get the needed info from the o2 sensors. The car will drive normal, just getting worse gas mileage.

Once again, this sounds a lot like a blown TCM.

01_blue_max

maybe they screwed up your car to get you to come back. meinike and midas both are bad about that.

makaveli3004

I took it to my friend whose a mechanic we scanned the codes... He said deff the cat is bad but chances are the o2 sensors are good.

Scottwax

iTrader: (8)

If the cat is clogged, it will definitely limit your rpms and acceleration. When my old 626 got rear-ended, the exhaust tips were bent under the muffler and my car had very poor acceleration, plus the transmission kept hunting between 3rd and 4th gear. Once I bent the tips back into place, my car ran normally again...well as normally as possible for having a bent rear axle and lots of body damage!

upstatemax

iTrader: (15)

I doubt his Cat would clog up over-night...

However, I would check the work done on your B-Pipe and Muffler... make sure they did not screw it up and plug off your exhaust.

Very simple to remove the back half of the exhaust and check the B-Pipe, Muffler, and Cat for clogs.

Also, if your exhaust was plugged off from a clog, the exhaust note would sound WAY off, even at idle.

Scottwax

iTrader: (8)

Unless the goons at the muffler shop left a shop towel somewhere in the exhaust.

I would never trust a muffler chain to work on my exhaust. Luckily, there is a shop in my area that takes real pride in their work. More expensive than the chains but they build great exhaust systems.

makaveli3004

so it might not even be the cat?

upstatemax

iTrader: (15)

If that was the case... That towel would have been ash in no time, especially with the car running at 4,000 rpm.

But I also would not put it past a chain muffler shop to screw with him and screw up his car.

He needs to bring it back to his mechanic friend and they need to tear off the exhaust and inspect it, also look for any foul play in the electrical department because this sounds like a textbook blown TCM.

Now a blown TCM DOES NOT indicate foul play... They can blow anytime. I had one go on me right before the wife and I were taking off for a trip. We stopped at Burger King before we jumped on the highway, the car was acting fine when I parked it, came back out 10min later, started the Max up and drove off... Car refused to shift out of first for quite a while, finally got it to shift to second after about 5 minutes... Got it to the dealership and it was the TCM.