My 2001 TL began running rough at idle and while revved up shaking .THe car has 140,000 on it and ran pretty well until just recently. What should I try first second third please help we need to be able to drive this car asap

 

Spark plugs, coil packs, vacuum leaks, egr valve...

Is the check engine light on?


I had some coil packs go bad and the car would shake under throttle. Replaced the all because I had 120k miles and didnt want to be replacing them one-by-one. Also done the spark plugs while I was in there. Very easy to diy

 

1st = IACV Valve
2nd = MIL Codes (Check Engine Codes)

 

Dash is lit up like a Christmas tree but that didn't stop it from running great and with the code reader making it thru inspection. Where is the iacv can I just buy that at AutoZone?

 

IACV likes to clog up and needs a good cleaning with TB Cleaner (EASY DIY), No need to buy a new one unless you burn cash...

 

Also try this, Just need an allen key and a few minutes.

 

Okay great I have a couple things 2 try now I can determine which cylinder is bad n maybe buy a coil pack to see if that works where is that valve located I can't find it in the Haynes manual

 

And what is tb cleaner

 

Throttle Body Cleaner? = comes as a Spraying Can in Autozone..
Seems to me your not very used to moving stuff in the engine, should leave it to a mechanic unless you wanna start your DIY career..

 

Funding may be the cause of my current diy career the car has actually run great I have the bad transfer code but no symptoms did the 3x3 so far so good never touched the engine except oil changes

 

Bad transmission code

 

Then cleaning the IACV should be a walk in the park.. Dunno if you have seen the DIYs but its pretty straight forward; Remove intake tubes > Remove Throttle Body > Remove IACV just by the 2 Philips screws > Clean it and Vualá!! You got your RPMs in check again.

 

Okay did the coil pack test idle goes down on all cylinders ect one so auto zone is right down the street going to buy a coil pack also when I took the engine cover off there is oil in each pouch of the top of motor does that indicate anything? Thanks so much for help so far

 

Post the code numbers. That could take out the guess work.

 

Middle rear coil pack replaced got rid of the shake and roughness now I'm motivated to change the transmission filter or anything else to save this transmission you guys rock

 

Took the what you Guys called the engine cover at auto zone and can't figure out what that gasket is called please help the very top cover with like 8 bolts

 

The gasket generally doesn`t need to get replaced. Just make sure you put it back the right way.


The top cover of the engine if it is caked with carbon deposits you can bet the EGR valve, IACV valve and the throttle body is the same way.


If so brake cleaner for the EGR valve and ports. TB cleaner for the TB and IACV valve.


Also 1 can of seafoam in the gas tank when it is almost empty.

 

First, have the CEL codes read. Then, clean things like the EGR passageways, TB intake, and IAC valve. Check out the 2nd Gen's "DIY" sticky for tips and details on procedures. Clear codes and see if they come back.

Post the codes and we can better help ya.