94 code pull

[mgmgmg]

Im having some idle issues

I did a key on code pull

c= 336
0= 114,116

I have not done a warm key on yet. could i get some imput on these codes..

 

[MrShorty]

KOEO 114/116 are almost always operator error, namely pulling codes on a cold engine as you indicated. Repeat on a warm engine.

CM 336 is an EGR code. The PFE/DPFE sensors on these have issues. 1st thing I'd probably do would be to run the KOER test to see if I got an equivalent EGR code. Check the PFE/DPFE and wiring between the PFE/DPFE and the PCM. Check the vacuum lines to the PFE/DPFE.

 

[mgmgmg]

well did a warm test

koeo 111

koer 11, 111

Its crazy i feel like im chasing a ghost here?

And when it gets warm, it seems to straighten out.

Anybody?

 

[MrShorty]

1st question: did you clear CM between the 1st test and the 2nd test, or was the 336 really a KOEO code?

In either case, it looks like you have an intermittent fault in the EGR system (a "ghost" if you like). It sounds like it is mostly on a cold engine.

If I were in a "guess and check" mood, I'd change the DPFE and cross my fingers.

If I wanted to see what was going on, I'd figure out how to monitor the DPFE signal as the engine warms up. Easiest would probably be to get a scanner and use that to monitor the DPFE signal. I'm not familiar with the EGR systems on these (though I believe it is roughly similar to the EGR system on my BII). There should be a way to attach a voltmeter to the DPFE circuit and monitor the signal that way.

I've never used it, but these have a "wiggle test" self-test mode which might be useful to see if you can locate a loose connection in the DPFE circuit.

 

[mgmgmg]

To clear your question:

The first test was a Koeo cold;

O=114,116
C=336
so the 114,116 was because of a cold engine


Then I did a Koeo warm the next day; 111

Koer warm 11, 111

So im guessing the dpfe is faulty when cold?

 

[mgmgmg]

Replaced the DPFE problem solved......

 

[walterd140]

By the way, 111 is the code to tell you it is reading. This should be flashed as:
111
111
1
Now your problem codes will read
I learned this using the paper clip method DaRoche put a sticky up on. He has a link to all the codes posted there, just gotta dig for it

 

[mgmgmg]

ok so im back to the same problem again? I replaced the DPFE sensor 3 weeks ago it seemed to fix the problem. Now this morning im having the same problem with rough idle. When i did relace the DPFE sensor i did leave the neg. off for about 1 hr to reset.

I did a code scan again this morning

c 336

Heres my basic morning My x is in the garage start it up rough idle drive to a stop sign about 1 min of driving stop the x will lunge at a dead stop. Then drive to a stop light about 3 mins of driving problem gone x doesnt lunge or idle rough. it runs great.

Ive done a full tune up myself 10,000 miles which i replaced the FPR at that time. I replaced the MAF 6 yrs ago because my x wouldnt shift into overdrive fix that problem...

any input would be great....

 

[MrShorty]

Can I assume it passed the KOEO test (that first set of 111's mentioned above)? Do you get a similar EGR code from the KOER test?

My code list says that CM 336 is from the DPFE indicating "high"? I'm not sure what that means -- anyone familiar with these know if that means high pressure?

Have you looked over the wiring and hoses to the EGR system to see if everything looks right?

 

[mgmgmg]

Look i have a question does the DPFE senosr buzz really loud? My DPFE sensor buzz's really loud!!! the hose's are clean. On a KOER no codes pull up just a cm 336 wiring looks ok for what i see.... Im just lost ?? I do feel that is has to do with something in the EGR system


P.S I do have a code reader and book to find what codes mean....

 

[mgmgmg]

ok i did something i pulled the vac. hose off the egr valve when idle and it idles smooth!!! but when i put it back on it idles like crap....EGR valve the problem???

 

[MrShorty]

Look i have a question does the DPFE senosr buzz really loud? My DPFE sensor buzz's really loud!!!

Unfortunately, I don't know. I wouldn't expect it to buzz. Anyone with an EGR system comment?

Assuming it shouldn't buzz, a buzz suggests to me a leak or something like that.

Because my '92 doesn't have an EGR system, I'm not very good at diagnosing these EGR's. I'm not sure which vacuum hose you removed from the EGR valve, but maybe it indicates a problem with the valve, or maybe the EVR solenoid is stuck open or something like that.

 

[mgmgmg]

Just put in a EGR Valve.....That was the problem......Finally !!!!!!! wonder why i didnt get any codes....

 

[MrShorty]

wonder why i didnt get any codes....

:scratch: But you did get a code: a CM 336 - which points to a fault in the EGR system. Remember that codes by themselves don't tell you what component to replace. They only tell you what fault condition the computer saw, and then we are expected to determine the specific cause of the code.

Unfortunately, because the DPFE's fail a lot more often than the EGR valves themselves, that was the first thing that was suggested to look at. The EGR valve itself actually seems to be the most reliable component in the EGR system, and so it gets left as the last thing to check.