325 RPM problem.... HELP... - BMW Forum

Raz325 · 01-05-2009, 05:54 PM

I have a 93 325is 5spd 130k, The problem i'm having is when im driving the rpms hold and sometimes increase when i let go of the gas pedal. I had IAC problems when the winter started so I had it changed, It had the same problem before to. Ive sprayed everywhere under the hood looking for a leak and nothing. Anyone have any ideas?

PS: First BMW...

olds72 · 01-06-2009, 08:18 PM

you may need to clean the throtle body. My VW did the same thing. I had to take off the air intake and spray some carb cleaner, then use a small wire brush to scrub in there.

Raz325 · 01-08-2009, 02:29 PM

Thanks. I'll give that a shot. I sprayed the MAF out but never the throttle body.

ian3 · 01-12-2009, 09:11 PM

I had the same problem and my check engine light came on......but after I cleaned the throttle body it turned off...

keykey · 01-13-2009, 02:44 PM

Quote:

Originally Posted by Raz325

Thanks. I'll give that a shot. I sprayed the MAF out but never the throttle body.

If you sprayed the MAF with anything besides MAF Cleaner spray then the MAF could be your problem. Carb cleaners and such sprays leaves residue on the wire and it could break completely or not perform as it should.

Have you scanned for DTC's (Fault codes)?

Raz325 · 01-13-2009, 05:44 PM

I cleaned it with carb cleaner an it runs the same as before so I dont think it hurt it at all. When i got the car it showed a air temp sensor code, I erased the codes and it never came back, About 3 weeks ago the check engine light came on and it was for the o2 sensor. Ive had this rpm problem for a long time and all the time so I dont think thats whats causing it. I honestly dont know.

marti5 · 01-14-2009, 07:44 AM

Still sounds like the MAF to me, or one other thing really,Camshaft sensor

marti5 · 01-14-2009, 11:27 AM

May also be throttle position switch.

benneo · 01-14-2009, 12:09 PM

had the same problem turned out to be a split in an air intake hose(thats what the dealer called it!) then couple of weeks later it returned only for it to be the new nonbranded floor mat was moving under my heel and getting trapped between the gas pedal and my foot! my mate has had a small stone that was stuck under the gas pedal and it had the same effect.

Raz325 · 01-16-2009, 07:07 AM

I did switch out the throttle position switch already, didn't help... Its funny you brought up the floor mat cuz I just noticed the other day that it was riding up the bottom of the gas pedal, I moved it back but no luck... I can open the trottle under the hood to rev it up and close it all the way by hand and it still does it.. I read that the 325's had a recall on the throttle cable so I thought that could of been it.

Raz325 · 01-16-2009, 07:10 AM

I noticed that my car redlines at 7000k, That would mean theres a chip in it rite? could that be the problem?

bimmerguy82 · 01-19-2009, 04:01 PM

maybe ICV is dirty.

Raz325 · 03-14-2009, 11:48 AM

Problem solved. I cleaned out the old IAC like you said, got it nice and shiny. It still didnt fix the rpm hang up problem, I did find some cracks starting to form in my intake boot but not all the way through... How I found out what was killing my car was by killing it.. I took my car to the car wash and got a turbo II undercarriage wash, killed it instantly... I looked into it and found out that my ecu bay got full of water and took out the ecu, I bought a new (used) ecu and the car came back to life.. After it was back running I switched the Dinan chip over and the rpm problem came back, Bad chip! Got the factory chip in it now and it runs great. Now I have to find out how it got water up there... lol.

witeshark · 03-14-2009, 12:47 PM

Glad you sorted it!