It's been a while since I posted here, I guess that's what happens when your toyota runs without any problems for years...

I have a 98 Toyota 4Runner SR5 4WD. It has the supercharger, the split second FTC, aftermarket fuel injectors (larger ones), iridium plugs, and higher rate fuel pump. My 4Runner has been running like a champ for nearly 3 years, but now around the 27-2800 RPM range it seems like it's choking out, then the check engine light starts to flash. It only happens when I get on the accelerator harder than normal. Sometimes the check engine light will flash, then remain off, sometimes, it will flash, and remain on. When it remains on, I reset it by disconnecting the battery. Any ideas about what could be wrong?

I took it to the German Toyota dealer, and they replaced the coil pack for the 4th cylinder. Didn't make a difference, except in my wallet. <img src="/forums/images/graemlins/zombie.gif" alt="" />

My ideas... O2 sensor, or spark plugs, but the plugs look fine.

Thanks,

Spence
Ramstein Germany

The coil pack replaced the distributor on these.
Buy yourself an OBDII tester from NAPA online and investigate it yourself.

Download an FSM www.techinfo.toyota.com

If you've got other than the stock air filter on it, you might have a dirty MAF. See my second sentence.

The Auto Skills Center on base should have an OBD-II reader... Try them first. They can pull your codes for you.

Or, you can bring it up to me. I'll look at it when I have time (been busy with pre-deployment stuff). I am only 20 minutes away from you, now that I relocated to Baumholder.

Thanks for the replies!

I own vol. 1 and vol 2 of the factory repair manuals. I bought me a ODBII computer. Here's what I got...

P0014 "B" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1).

P0300 Random/Multiple Cylinder Misfire Detected.

P1400 Sub-Throttle Position Sensor.

And the mystery DTC... P3500.

So now I know the codes, but...what does it all mean?

It means: now that you know your codes, follow the troubleshooting tree for your respective codes in the FSM to wring them out.

Your timing is set with the OBDII tester; start there, as it'll likely throw everything else off if it's not set up correctly.

Man, I hope it's my timing because while I was driving home from work today I felt a thud a few times in the 35-40MPH range. While I was on the autobahn, I was doing about 90MPH, but couldn't go faster because I felt the studdering from the engine that I usually get at the 2800RPM range. I re-ran the OBDII computer, and got more codes...

P0001 Fule Volume Regulator (Not listed in repair manual).

P0014[B] Cam position -timing over- advanced/system performance (Not listed in repair manual).

P0120 Throttle pedal position sensor/switch circut (listed in repair manual pg DI-7 and DI-36).

P0130.02 Sensor Ciruct (Bank 1 Sensor 1) (listed in factory manual pg DI-44).

P0602 Control Module Programing Error (not listed in factory manual).

P1400 DPFE circut low input (not listed in factory manual).

P1800 Trans Clutch interlock safety Switch Failure (not listed in factory manual).

None of the following are listed in the factory manual.
P2000 Mystery code
P3500 Mystery code
P01CA Mystery code
P01FF Mystery code
P2E00 Mystery code
U2101 Mystery code
U2102 Mystery code
U3F04 Mystery code

So anyways this is way to advanced for me to deal with, so I thing I'm going to break my bank and take it to the dealership, although I wish I could do it myself. I looked in the manuals, and I can't even find most of these codes.

Maybe the problem is the Split Second FTC. Maybe I should disconnect it, and just hook my ECU up straight. I just don't know how that would affect the after market high flow fuel pump, and large fuel injectors. I do have an AMSOIL airfilter. Maybe the oil from the filter as caused my MAF to go bad...as it was mentioned above by Kewlynx. Anyhow, any advice or tips would be greatly appreciated.

Thanks for your time.

SJ

I had problems similar to that thanks to a broken Knock sensor wire on my 89 22re.