Help!! ROugh Idle when at running temp..

scoobyleg1 · Post by **scoobyleg1** » Thu Dec 13, 2007 1:35 am

So I just did a FULL gasket rebulid on my motor..91 sport sedan..

list of things new..
Spark plugs
plug wires
coil pack
starter
fuel pump
fuel filter

SHe runs fine untill she gets to running temp, and then she starts to idle really rough and when I come to a stop..she almost dies..I cant go past 3500Rpms...

Im confused and dont no what to do..

asc_up · Post by **asc_up** » Thu Dec 13, 2007 2:03 am

ummm why is this here?

scoobyleg1 · Post by **scoobyleg1** » Thu Dec 13, 2007 2:27 am

sorry i didnt no where to post...please have someone move to right place

vrg3 · Post by **vrg3** » Thu Dec 13, 2007 2:40 am

Search for "starting fluid" with me as the author. Read the threads that come up and start with what you find there.

scoobyleg1 · Post by **scoobyleg1** » Thu Dec 13, 2007 10:24 pm

OKay so I tried it and ..no vacuum leaks

Ive been trying everything I can think of..
IT comning down to replacing everything..

ericem · Post by **ericem** » Thu Dec 13, 2007 10:59 pm

Any check engine light? Did you change the timing belt? Maybe you forgot to plug something back in. Check if you plugged in the hose for the IAC valve to. You also say you can't go past 3500 rpm's. Were any of these issues there before the gasket rebuild? Could be a CAT. Could also be a valve.

Get a vacuum gauge hook it up to the brake booster line and see if you get over 20 something forget what they call the rating now? Usually the guage comes with instructions and tells you what level you should see for a normal engine, and says the pressure for troubleshooting. If your in the 20's its definitely a electronic issue.

Here is a site

http://www.classictruckshop.com/clubs/e ... ac/uum.htm

scoobyleg1 · Post by **scoobyleg1** » Thu Dec 13, 2007 11:21 pm

ericem wrote:Any check engine light? Did you change the timing belt? Maybe you forgot to plug something back in. Check if you plugged in the hose for the IAC valve to. You also say you can't go past 3500 rpm's. Were any of these issues there before the gasket rebuild? Could be a CAT. Could also be a valve.

Get a vacuum gauge hook it up to the brake booster line and see if you get over 20 something forget what they call the rating now? Usually the guage comes with instructions and tells you what level you should see for a normal engine, and says the pressure for troubleshooting. If your in the 20's its definitely a electronic issue.

Here is a site

http://www.classictruckshop.com/clubs/e ... ac/uum.htm

No Issues before the rebuild...I checked the valves before I put the heads on..all were good..

ericem · Post by **ericem** » Thu Dec 13, 2007 11:41 pm

Did you touch the timing belt?? I still suggest you go over all the wires and make sure everything is connected.

scoobyleg1 · Post by **scoobyleg1** » Fri Dec 14, 2007 1:19 am

Yeah I replaced the Timing belt...Ive dont plenty of belts..its timed right..

vrg3 · Post by **vrg3** » Fri Dec 14, 2007 4:05 pm

You sprayed the starting fluid all over? I thought I had done the starting fluid test many times over with negative results before I actually found my leaky intake manifold gasket.

Hmm. Any chance you disassembled and reassembled the IAC valve?

scoobyleg1 · Post by **scoobyleg1** » Fri Dec 14, 2007 10:58 pm

vrg3 wrote:You sprayed the starting fluid all over?

Hmm. Any chance you disassembled and reassembled the IAC valve?

Yes I did..I used almost 2 cans of it..

And no I did not touch the IAC valve.

Jaketips42 · Post by **Jaketips42** » Sat Dec 15, 2007 4:10 am

Is the coolant temp sensor plugged in/known good?

555BCTurbo · Post by **555BCTurbo** » Sat Dec 15, 2007 4:16 am

Mass Airflow Sensor?

scoobyleg1 · Post by **scoobyleg1** » Sun Dec 30, 2007 9:07 pm

555BCTurbo wrote:Mass Airflow Sensor?

I got a new MAF sensor.

vrg3 · Post by **vrg3** » Tue Jan 08, 2008 4:37 am

Wait -- you have two separate symptoms? Rough idle plus you can't go past 3500 RPMs? Explain more.

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Help!! ROugh Idle when at running temp..

Help!! ROugh Idle when at running temp..