Bearcat94

2002 TL-S. ~122k miles.

Normal maint, w/Mobil1 (or similar) synthetic. 93 octane gas all the time. Timing belt, plugs, etc., (105k service) completed at ~4/28/08 (66k miles).


Today got stuttering and flashing CEL on start up. Some stuttering after warmed up and no CEL. Later, cold start, got stuttering and CEL at ~45 MPH.

Codes pulled at Autozone:

P0303: Cylinder 3 Misfire
- Vacuum leak
- Ignition System
- Blocked/Faulty Injector
- Engine Mechanical

P1399: Random Cyl Misfires
- Blocked EGR Passage
- Valve clearance




What should I do?


TIA

justnspace

iTrader: (1)

Bearcat! long time no chat! sad it has to be in this situation, tho.

for the EGR valve, you can unbolt the two bolts that hold it and pick off any carbon that is in there.
This should clear both codes, unless the car has been overheating. has the car been overheating?!

justnspace

iTrader: (1)

and I didnt know your name was TIA.

Thanks In Advance

Bearcat94

OK, that's what I was hoping .... EGR Valve. I'll clean it and see how it goes.


Is it OK to drive for a day or so?



(TIA = Thanks In Advance you leg humper.)

justnspace

iTrader: (1)

as long as the car isnt overheating, I believe its the EGR valve.
it is okay to drive, as long as you dont mind the stuttering due to the EGR valve being blocked by carbon.



and you're slacking. check for white text!

Bearcat94

Right - it is not overheating.

fsttyms1

On the 2nd gen the EGR code is usually caused by the 6 ports that get clogged under teh cover. Id pull the top intake manifold cover off and look for blockages in that and the 6 holes.

As for the misfire, it could be the egr causing a false code, or it could be a coil on #3 going. (very common on these)

Bearcat94

Will do. If none of that works, I'll try the coil next.

3.2TLc

Yeah, if it's been awhile....clean the EGR passageways and TB intake.
Check all the wiring and vac connections.

Bearcat94

:grrrr:


Cleaned the EGR chases and holes - they were pretty grimy, but not fully blocked.

Could not clean the EGR Valve because I stripped one of the nuts and couldn't get it off.

Seems a little better, but not fixed and still getting hesitation and flashing CEL under throttle at ~45 MPH.

I'm going to check the coils and if OK, take it somewhere to get the EGR valve removed and cleaned.

3.2TLc

Hey Bear, remove the coil from the #3 cylinder and see if it makes any difference in the idle rpm.
Pull that plug and see how it appears. Ya may want to buy one new coil and try it on that cylinder. Reset the ECU and see how it runs.

Bearcat94

Which is number 3??

3.2TLc

Hey Bear, the #3 cylinder is located on the far right side of the motor's back side towards the firewall.

Bearcat94

OK, thanks. Just to make sure I'm looking at the car from the same POV, you mean this one (the red one), right?





I'll probably check them all just in case.

3.2TLc

Yeah, that's the #3 cylinder that ya wanna try eliminating as a problem first.
But, with random multiple misfires...it could be just that, a random situation.
Gotta start somewhere !!! Good Luck, man.

justnspace

iTrader: (1)

firewall
123
456
radiator


this is how i always remember.

fsttyms1

That only works if the coilpack is completely dead. You can try that and see what happens. You could also move that coil pack to a different cyl and reset the ecu and when the cel comes back on see if the misfire followed that coil pack.

Nicks2001tl

Before the transmission went on my car I had the P0740 code and the p303. Checked all the coils one by one and find out the number 3 was bad.

Replaced it and problem was solved.

Bearcat94

Did this yesterday. Pulled the plug on each coil pack in turn. All caused a change in idle (tone changed and caused some roughness/hesitation/stuttering.


I've got to get the EGR Valve out and cleaned (or replaced) before anything else.

Looks like I'll need to take somewhere where they can get the nut I stripped off.

3.2TLc

Hey Bear, did ya pull the #3 plug and check it ? Did ya swap #3 coil with another after CEL reset ? If everything seems the same, check all the vac hoses and electrical connections. Have ya done any recent work ?

Ya could also try some fuel system cleaner, maybe got some bad gas or an iffy injector. Perhaps try checking the fuel pressure ??? Personally, I don't think that the EGR valve is bad if the passageways were not totally clogged.

Bearcat94

Had to go out of town for a few days, so dropped it off at the local shop. They did their diagnostic and say that the plugs and coils are good, but compression is inconsistent cyl-to-cyl (140, 120, 130, etc.).

They think the valves need adjusted and that it's related to the CEL/misfires. The car does (and has had for a few months) a pronounced 'tick' when running.


At 122k and .... 10+ years, I don't doubt the valve could use/need adjusting. I just don't know if that would account for misfires and the CEL.