Hi everyone, appreciate any help available!

Bought a 97 Discovery about 3 months ago, I like it, but she has some issues!

Main priority is the rough idle issue. I've read a lot of posts on rough idling LRs, and a lot of different opinions, so I got a basic code reader and the codes, now trying to diagnose from the codes.

The idle was erratic, sometimes it would idle normal, sometimes about 2000rpms, mostly around 400rpms, or less and would die when coming to a stop.

I've cleaned the throttle body and replaced the IAC and fuel filter. She ran better withe the IAC unplugged, so I replaced that--no difference. I'm now running with it unplugged, because it is at least consistent that way--low/rough especially at start up, but at least does;t stall (or jump up to 2000rpms). Drives fine, though a pig on fuel, but that might be normal, sounds like.

So, hooked up the scanner and got a whack of codes, but still not sure where to start. I think a new MAF is in order, but I think those codes could be caused b other things....

So, hoping to utilize your experience and knowledge!

OK, the codes are:

0102
0103
0150
0153
0301
1313
1316
1508

DOn't seem to be able to erase them either, or if it does erase, they are back on startup.

Anyone experience this?

Thanks,

Jason

 

Sure sounds like IAVC (stepper motor) and or vacum leak. Chased mine for a couple weeks. What I did to test: take off the hose connected to the IAVC with engine running. Put your finger over inlet where hose goes. If it changes the idle speed, bingo, you found your problem. Go to a u pull it yard and get several of them. Ask for a mid 90's model Chevy truck or van. Thats's what I did. Kept changing them out until one of them worked.

 

Hey thanks for the reply. I figured that so I've replaced the IACV already-no difference. And there's no vacuum line on mine, as far as I can tell?