More likely a meth pump in decline than a fuel pump. Methanol is tough on those pumps, and a decrease in methanol flow creates a lean condition. But we're just guessing. It could be a number of things.

 

I would agree with Ted.

Meth pump seems the likely culprit.

 

What Meth kit are you running?

 

im going to say it isnt the meth pump. for a number of reasons. this happend when not in boost at all. normal driving right now. and its also a new pump i installed just before the tune.

also i would think that if it was running that lean under normal driving, wouldnt i have other problems already, like burned valves. or something i would see in my vac gauge? the vaccuum is very steady at idle, even with the big cams.

now for my last question, has anyone ever saw a hks twin ing. amp go bad? i would think if one was to go bad than it could cause the spark to be way too hot at the normal driving when its not needed to be hot.

im leaning that this is more of a hot spark issue rather than a tuning or fuel issue because the only thing that is damaged that i can see is the plugs and im also starting to get a slight mis at about 2k

 

These two statements contradict each other, so which is correct?

One pass down the strip is enough to destroy plugs, engine, and all if the engine is detonating. If you tell me these plugs were destroyed without so much as even a single WOT event, I would urge you to not even drive the car in its present condition.


The ECU is in closed loop operation when at part throttle, so there should not be a mixture problem there.

Not even a strong CDI setup can destroy those plugs like that. But if it makes you feel better, bypass the HKS unit.

 

I would bet on the fuel pump going weak, I replace mine every year because I ran in to this problem long ago.

Fuel pumps are cheap and easy to replace so try that first and report back.
'I have seen this problem over and over with old walbro 255 pumps.

 

ok, sorry for the confusion ted b. the first set it happened with only one pass down the strip. i put another set in just recently and put about 75 miles driving around town and can already see the wear and i wasnt boosting at all. and if the ecu should not have a mixture problem at part throttle than that should eliminate a tune issure and also a meth problem, sence im not in boost and using the meth. i have unplugged the hks unit but its snowing and cant drive the car right now.

xspsi4. when you had this problem, did your plugs look close to mine? i will check the fuel pressure tomorrow. and i will prolly just order up a replacement just in case.

 

If you didn't get into boost one time during that 75 mile period, that raises a different set of concerns. You need to scan the ECU for codes, you need to make a part throttle log and check knock counts, and you need to pressure test the intake system to see if you have a major air leak under vacuum. I recommend doing these things ASAP.

 

holy cow lmfao

 

ok, thank you. i will be working on that today as well.

 

This would be my guess as well. I have an activation LED wired into my meth pump to ensure it's on when I want it on as well as an LED as a level indicator. I would disconnect the feed line from the UICP and apply power to the pump directly and see if it's firing. Then check the meth nozzle and make sure it's not blocked. Meth is very caustic and it eats components fairly quickly, especially if you don't use the system often. It sits there in the pump, tubes and nozzle and eats away. You really should check the system monthly IMO. Those plugs should last between 20 and 30K miles in my experience. I run the same plugs at high boost everyday with meth and they work perfectly with 10K on them.

 

Forgot to say, you REALLY need and functioning wideband gauge if you don't have one already. You can't just assume a tune is doing what it's supposed to do all the time without any way of verifying it.

 

i have a good wide band in it and this is happening not when in boost as started. the meth shouldnt be truning on at that time.

 

Is it possible you have a dead injector? I'm having a hard time seeing that level of damage, under closed loop conditions in such a short amount of time without a major lack of fuel or extreme part throttle detonation. Are you tipping into boost at all? Not WOT but just a few PSI? I wouldn't drive it at all until you find the problem and fix it. I think the only reason you haven't burnt a piston is because they're forged.

 

well considering its on all 4 spark plugs, i wouldnt think its 1 injector. it could be all 4 but they are new as well. im going to run out now and see what the fuel pressure is at and check for any hosses that might have come off.