Engine/Transmission (1998.5 - 2002) Too much timing on HO Engine?

[BDaugherty]

Does anyone else have this problem?? Am I imagining it??

I have a 2001 HO 6spd with an Edge Juice W/Attitude. I'm also running a PSM cold air intake. The other day I was pulling around 8-9K lbs in 35-45 degree ambient temperature. At highway speed, my intake air temperature was around 94-96 degrees. I really felt like at lower engine speeds 1600-1900 I had too much timing. I don't know how to describe it other than it sort of felt like a slight miss. My fuel pressure was steady at 18-19 psi and I didn't notice it at higher engine speeds. I wish I had a way to adjust the timing on the fly to see what difference it made. I really don't have a good baseline for comparison since last winter I was running the stock clutch with a K&N intake. I couldn't use very much power with the stock clutch and I would assume that the K&N would have higher intake air temps, although without pulling the same load at the same power level, over the same path... etc, there's just no way to know. I really like my JWA, but right now I'm wishing for adjustable timing.

 

[Bob Cochran]

I had what I thought was a miss but it was a surging problem but that was using the Adrenaline. Quad fixed it but I am not sure it was a timing problem. If it was maybe others here know for sure and relate that information to your JWA.

 

[WestTN]

The HO engine has advanced timing compared to the SO. Adding timing with a box should be done carefully if towing.

 

[jkidd]

If you have 3. 55 gears and 315/75 tires you want RPMS higher 1800+ 2000 is better



HO do have more timing and higher compression. You can always turn off the JWA and see if the miss goes away, but if you are under a load you need higher RPMS, even with 4. 10. My truck likes above 2000 RPM when towing and going up a grade. The MPG difference is not worth the extra stress on the engine and drive-train. Check out the TDR magazine and you will see the Brake specific Horsepower (fuel consumption vs. HP) is nearly the same from 1600-2100RPM

 

[blacksheepdiesel]

Could be the APPS? I have come to believe that the APPS is the culprit behind a lot of different symptoms on our trucks. Swap an APPS from a manual transmission truck that doesn't have that symptom and see if it repeats.

Godspeed,
Trent

 

[Gary - K7GLD]

My '02 had a tendency to display a random. erratic "miss", "bucking", or cutting out when first starting out under load in cold near freezing temps - very noticeable when towing the 5th wheel RV.



This effect would disappear as engine and ambient temps increased, and was not a problem in warmer temps. Mine also had a noticeable timing "rattle" under low RPM load when I had the Smarty programming loaded - but was never an issue with the Edge Comp - I eventually dumped the Smarty, use only the Comp, and no more rattle.



I am also now running a spare ECM I picked up a while back, and haven't noticed any more random missing in cold temps - but haven't towed, either, so dunno if a combination of events has eliminated or reduced timing related issues - just glad they seem to be gone!

 

[woodtrucker]

I know this is an old thread. I have 275's and an edge EZ and on level 3 in winter it runs like crap. Just what you guys (very few people online) have experienced. I've been chasing problem and I can't find a single thing to cause this so I would chalk it up to too much timing as well. If I take tuner off it doesn't do it. Wonder if I should move to the edge comp?