2GN.ORG

2004 Neon SE. Low Idle in Drive when stopped (yet again...) without AC.

Even with AC ON I had the motor die twice. (but started right back up).

What I have done:
1. Cleaned the IAC with crab cleaner. Wasn't really dirty. Cleaned the Throttle Body and removed any oil in the Intake from the PCV hose. Plugs are under 10 K miles old NGK V Power. Seafoam'ed 10 K miles ago. Timing belt etc done same time.

Here is what I am planning to do (in order). Anything totally unrelated let me know.

1. I have a P0441 code and I am going to look at the evap unit on the rear for holes/rotten hose etc...

2. Check the hoses from the throttle body/IM, brake booster hose tc..., bellows between the IM and the TB etc..

3. Run fuel system cleaner...?

4. Check plug wires for Resistance and change them if needed...

4. Replace IAC. (anyone have a known good low miles IAC?)

5. Replace TPS.

6. Last put a small hole / notch at the edge of the throttle plate inside the throttle body)

You can also attempt to clean your IAC and TPS i would not drill holes in your tb untill you have exhuasted every other option

You may want to pull off your MAP sensor and look at it's condition. IIRC, you can clean it with NON-chlorinated brake clean. A restricted MAP can cause a lot of what Chrysler used to call "driveway speed maneuver" problems.

I have done both. MAP (the one on the IM near the PS pump right?) i cleaned it with brake parts cleaner though . Also I cleaned IAC with of crab cleaner. Wondering it any of it sneaks into the coils inside vai the gap in the shaft.

How does one clean a TPS?

gcretro wrote:
How does one clean a TPS?

I don't think you can really do much with it. Possibly spray contact cleaner on it, and hope it soaks in. Then some penetrating oil, so the "cleaned" coil of the rheostat doesn't oxidize. That's the trouble with most contact cleaners I have used: whatever you spray with them, usually gets worse, if you don't protect the contacts.

I really doubt the TPS can be cleaned...

How about the Cam position sensor? Would that cause low idle? Th only code I have is for P0441 that too started only like 3 weeks ago but I have had low idle for a longer...

gcretro wrote:I really doubt the TPS can be cleaned...

How about the Cam position sensor? Would that cause low idle? Th only code I have is for P0441 that too started only like 3 weeks ago but I have had low idle for a longer...

when mine have went ive had studdering and other problems there not that expensive i would fix that before trying to continue the diagnosis

So the cam sensor was changed by the previous owner at the dealership around 60K miles. I have 112K miles now. Are they a frequent failure item?

On a NGC engine, yes.