360jeepboy

The car is an 05 with a LS2. Mods include Longtube headers, Ported intake manifold, bored throttle body, intake, and tuned. the tune has been on the car for more then 3 years with no problems.

So I when I let off of the throttle I get a surging feeling coming from the car. She won't idle for snot, idle goes up and down and is very rough, and will pop from the exhaust after coming down off of a rev.

Check engine light came on with the code P0106 which is the MAP sensor performance. So I bought a new MAP sensor installed it and it still does the same thing and threw the same code even after I cleared it. I let it idle for a good bit and took the car around the block and still the same.

My Jeep has the transmission out of it, and I have been using the Vette to drive daily. I just got moved to work 40 miles from my house and my wife has been driving me for the last two days. I need to get this fixed ASAP and I am at a loss.

What do you guys think?

owc6

I know less than nothing, but have you checked to make sure all the plug wires are firmly attached, and that none of them have a crimp/gap in the wires themselves?


lisa

berk4422

Who ported your IM and how extreme? Do you have a modified air intake or still using the stock box? Perhaps there is a vacuum leak in the IM or maybe there is some air imbalance in the IM due to porting that is just now revealing itself due to weak friction welds on the IM? Just guessing.

brightc6

did you replace the rubber around the map sensor it could be worn and causing the air leak

360jeepboy

Peak performance did the extreme port on the manifold taking out all of the post. The car has been running just fine until now. I have replaced the MAP and Cleaned the MAF and still bad. Throttle response also feels a little off. I checked my bolts on the manifold and I snugged them up a bit.

It seems to be a little better then before but still have a check engine light on and I don't want to take a chance with it on a hour drive back and forth to work.

360jeepboy

The new MAP sensor came with new rubber.

glenB

Have you checked the harness for opens, checked the 5V reference and ground at the sensor?

Do you have any kind of scanner to read the MAP?

berk4422

Something else to consider, maybe driving it with the bad map sensor caused the car to learn some bad air/fuel and the car needs to relearn with the new map sensor? Or maybe the new MAP sensor was faulty out of the box?

sevinn

Have you tried cleaning your MAF? Also could be an issue with your throttle body.

360jeepboy

Yes I have cleaned my MAF.

360jeepboy

Yes I have a scanner that can read real time MAP signals. I have not done any type of probing with a volt meter. Most all of my tools are still at my old house... we just moved 3 weeks ago.

FortMorganAl

http://www.obd-codes.com/p0106

Is P0106 the only code you are getting? There are a lot of other codes that would identify the specific issue with the MAP.

Is the engine temperature correct? A bad coolant temperature sensor can also cause the MAP model calculations to be incorrect and this code to be set.

wayback

Have you washed the eng bay ? I had the same problems and it was water in the MAF connector. Dried it out and all was well.

Now I just clean with quick detailer and a MF rag.

lar66BB

I had a very similar problem and it was an air leak between air bridge and throttle body.

etaylor14

Did you try disconnecting the battery for a while to reset the computer?

billyboy47

have you tried trading it in? on a more serious note, i wish you luck solving your problem with help from other forum members.

tennblkc6

this ^^^ . I know my engine ran like poo when I swapped in my ported throttle body and forgot to connect the harness.

1bdvet

If you are lost, and there is only one thing left, and bite the bullet and take into service were they have the machines properly diagnose the car. Hopefully the Tech will be sharp and honest.

Cherokee Nation

Hey guys: What is a MAP sensor? Where is it located at on a LS3 ?..Thanks

anarchy67

sounds like an intake or vacumn leak. here's a link explaning how to find it.http://www.popularmechanics.com/cars...-vacuum-leak-2