Skip to main content ↑ ↓
Topic: Idle Problems continue, Checked IAC, and TPS...Now WHAT!? (Read 2589 times) previous topic - next topic

Idle Problems continue, Checked IAC, and TPS...Now WHAT!?

Reply #15 –
pull the spout out when timing,put back in when done.New plugs,wires,cap,rotor,is the best thing to start with.But the rpm going up and down could be a simple as the map sensor,or as bad as a intake leak. Good luck,there is alot of good help on here.
1987 T-bird SportCoupe,302,5spd,8.8,3.27s,pbr brakes,spindles,2003 rear,18inch 06 gt rims!!!!:evilgrin:
2006 Gt Mustang,3v,5spd,8.8,3.55s,GT500rims.
1990 T-bird LX,3.8,aod,loaded,stock!!
1999 Trailblazer(wifes rig)

Idle Problems continue, Checked IAC, and TPS...Now WHAT!?

Reply #16 –
It's not the timing. This doesn't happen all the time. It's intermittent. Like I said, I sit for about 3 minutes before this starts happening.

Map sensor? How can I check this?

Anyone else have any ideas?
<---One must always remember to Remain cool, calm and collected when dealing with your fellow man, especially on the Internet....
-DMC24guy
[/SIZE]

Idle Problems continue, Checked IAC, and TPS...Now WHAT!?

Reply #17 –
Quote from: 1BDBIRD;121354
pull the spout out when timing,put back in when done.New plugs,wires,cap,rotor,is the best thing to start with.But the rpm going up and down could be a simple as the map sensor,or as bad as a intake leak. Good luck,there is alot of good help on here.


only undo the spout conn and replace the spout connector with the engine *****OFF*********

remove spout
loosen dissy bolt
start engine
set timing
shut down engine
reconnect spout and tighten dizzy bolt.


PAUL
imagine the tps on the bottom side of the TB. THats where its at on the 351w.  Pita

Idle Problems continue, Checked IAC, and TPS...Now WHAT!?

Reply #18 –
Quote from: DMC24guy;121355
It's not the timing. This doesn't happen all the time. It's intermittent. Like I said, I sit for about 3 minutes before this starts happening.

Map sensor? How can I check this?

Anyone else have any ideas?

The time delay makes me think it could be closed loop related...but normally O2 sensors don't cause a rolling idle.
Have you rechecked the codes after replacing the EGR? Certain codes can be 'hidden' by other codes.

You don't have the tools to check a MAP sensor, the only way for you to troubleshoot it is to replace it with a known good one.

Check codes - replace MAP sensor...then let us know what is up.

Idle Problems continue, Checked IAC, and TPS...Now WHAT!?

Reply #19 –
Quote
It's only after sitting for 3 minutes that the RPM's begin to fluctuate anywhere between 1k and sometimes as low as 400rpm. It's also during this time when I've noticed a strong smell of gasoline. I don't know if that has anything to do with it, but I thought I would point it out.

Hmmm....well, I'd suggest doing what Scott and Jeremy suggested first, with the MAP sensor. If you have a bad MAP then you will experience surging like that. The fuel smell could be a result of the constant dumping/purging when the idle fluctuates.

However...if the MAP situation doesn't pan out, and you've tried everything else here, then there is one other component that can lead to a code 33 (or 34): the cannister purge valve. It is expensive (~$80). But it can help.

You can actually check that situation right now: remove the hoses going to the charcoal cannister, remove the screw that holds the cannister in, and remove the cannister from the car. Now shake it...what do you notice? Is the charcoal inside disintegrated? Is it heavy and full of gas? If you experience either of these, that will at least explain your fuel smell. And obviously it would be time to replace the cannister. However, you have to wonder why either would occur. A faulty cannister purge valve would likely be the cause, plus I know firsthand that it can cause a fluctuation in idle and even a slight hesitation. That happened on my old '88 XR7. I went through all the same things as what you're going through now, and in the end a new EVP and purge solenoid made the biggest differences in quality of idle and driving performance. I just wanted you to have the information, keep it in the back of your head and continue with the suggestions for now, but remember that there are always last resorts. ;)