More Engine Surging problems. (VIDEO)

[Alex L]

um.. VAF should be 1-5v, not .25v to 5v.

1.5kohm for a VAT is right where it should be on a 90deg day.

repull your codes.

[GAboySVO]

You may need to check the ECT sensor output. Pull the codes again once the engine is warm.

[Decisions...]

Yes Mike you are correct, I am young and have much to learn on reading charts and troubleshooting and that is why I come to you guys for some wisdom, because I have nobody else to teach me.

So hopefully tomorrow I will take a reading with no heat in the car and get some new numbers like NavySvo had suggested and check the ECT sensor output. I will let you know how it goes. Thanks again for all the input

[Alex L]

huh. so the (very official looking) test procedure that navy posted is wrong?

test for VAF SIG - KOEO, from closed to fully open vane positions - Variable voltage from 1 to 5 volts without any breaks as air vane is moved through range

my guess is the previous code of 14 is going to be replaced by a code 26, VAF out of range.

[Alex L]

huh, never noticed that in the svo supplement before. but then again, never had a vam code thrown, and my idle has always sat at .985v. carry on, nothing to see here.

[NavySVO]

So what is up with this?

[Decisions...]

Sorry I wasn't able to reply to this sooner. But i took the reading with no heat in the engine bay and i was getting a reading of 2570 OHMS and the outside temp was around 68 Degrees, so that falls in perfectly with what the chart is saying correct?

[Alex L]

yes.

repull your codes.

what are the 2 white wires behind the throttle body with the red shrink wrap hooked to?

check the TPS signal voltage, key on, engine off, idle to WOT sweep. you said you swap TPSs, with a new unit, used unit? source? _any_ issues installing it?

[Decisions...]

yes.

repull your codes.

what are the 2 white wires behind the throttle body with the red shrink wrap hooked to?

check the TPS signal voltage, key on, engine off, idle to WOT sweep. you said you swap TPSs, with a new unit, used unit? source? _any_ issues installing it?

I will pull codes again tomorrow and see what comes up. And the two white wires on behind the throttle body is the new pigtale for the IAC.

TPS was set, but i will recheck the voltage on it. I had changed out the TPS with a new one from AutoZone when i started having these issues, and there was no issues installing it, everything went fine.

[svono50]

Don't forget to check the resistance on your EEC ECT sensor. That should be the one in the top center of the lower intake. Mine went out on me a few years ago and caused all kinds of weird intermittent issues once the engine was warmed up. Good luck with your diagnosis.

[Decisions...]

Ok, so i pulled codes again today after replacing the ECT and was coming up with these.

KOEO- 67 Park/Neutral circuit failure(I think this is irrelevant to my problem)
42 System Rich
53 TPS sensor to high ( I set TPS to .90- 5.10 WOT. I know the WOT is out of range)
54 Intake Air Temp or Vane Air Temp signal high
56 VAF sensor high/ transmission oil temp sensor too high
66 VAF signal low/ transmission oil temp signal low

KOER- 11 System checks OK


I don't understand code 56 and 66, don't they contradict each other. And i checked VAF signal and everything checked fine. So what direction should go now?

[BrianO]

not if it's dead.. LOL

[Alex L]

thats jacked up. ive never seen that many codes across that many sensors thrown at once.

whats your chassis and vref voltage at idle, 2k and 4k rpm?

[GAboySVO]

If you unplug the VAM, does it run the same as with it plugged in?

[Alex L]

What does VREF measure at the TPS harness end? At the VAF end?

stupid question time, is that 5v vref regulated in the EEC or externally?