rough idle/ rpm drop

601 Views 2 Replies 3 Participants Last post by jwernatl, Jun 28, 2011

BenLoves5.0s

Discussion Starter · Jun 27, 2011

I have a 92 5.0 lx and it's been running very rough for a while now. it starts right up but almost stalls if i dont give it gas for a few minutes for it to warm up. It also idled very rough and occasionally would almost stall out at lights until I cleaned the IACV. That seemed to solve the rough idle problem for a few days, but today i was in a drive through and it started idling a little rough and suddenly dropped to about 300 rpms and almost stalled. I drove home but the whole way it was kind of sputtering and wasn't running right. I am not very mechanically experienced, so i was wondering if anybody has any suggestions. Help would be very much appreciated. Sorry if it's a little vague, i don't really know enough to fully explain everything.

See less See more

Save

1 - 3 of 3 Posts

dtfan

· #2 · Jun 27, 2011

Looks like the IAC valve was not the main reason for the rough idle. Check for Diagnostic Trouble Codes (DTS). Check also the TPS voltage and for vacuum leaks.

Save

jwernatl

· #3 · Jun 28, 2011

I had the idle surge & lots of it.Sometimes it was to the point of wanting to stall the 5.0. soooo, - I cleaned the IAC and the MASS AIR - It helped wonderfully for a few days & then went back to the surging alot. SO, I replaced the IAC & after that it helped MUCHO. But it didnt stop it all together.

Now, It surges only a small % of the time. So I'm pretty sure it's the MASS AIR. Check that.

Also do you have you MASS AIR calibrated with your injectors? Kinda simple question but It's a thought.

I hope this helps.

See less See more

Save

1 - 3 of 3 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month