Runs Rich; No CE Codes

HOTLNC

HOTLNC

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REDHOT is now running rich (Ever since I replaced the Idle Air Valve.)

Could I have screwed something up? I did remove the throttle body to get to the Valve. I replaced the gasket and torqued it to specs.

Any suggesions why it would be runnning rich without throwing any codes?
 
RE: Runs Rich; No CE Codes

Running rich???
IAC???
Where did these come from???

Whatever became of the MIL on with the 181 code (extreme lean condition) in your other thread?

I second Driller's question: what makes you think you're running rich?
 
RE: Runs Rich; No CE Codes

The 181 code is on HOTLNC. I'm fighting a loose o2 sensor connector on it.

Running rich is on #1 Daughter's car REDHOT.

By running rich I mean a smell of unburned gas (she said) and 16 MPG. But I looked yesterday at it and it seemed to be running OK. Although she has complained that the car sometime will not start and sometime will not shift right -- as if the motor is barely running and the tranny can't fingure out what gear it is suppose to be. It did not do this to me while driving it for about a hour with about 10 start/stop cycles.
 
RE: Runs Rich; No CE Codes

This may be happening to you.

I just had a weird one. During replacement of my intakes gaskets I pulled off the vacuum line to the fuel regulator and gas started flowing out of it (not alot). Must have had a bad diaphram in it. I know this caused a starting problem because after car was turned off for 10-30 min. it would be very hard to start. When it did start black smoke came out of exhaust. $20 at parts store.

The guys are right, how are you determining 'running rich'? Need more details......
 
RE: Runs Rich; No CE Codes

Ok, forget running rich -- that is a rumor started by Daughter #1.

She is bringing the car to me now because it would not start. She had stopped to do an errand and after sitting for an hour refused to start -- cranked hard. Finally after three attempts it started.

So hard to start symptom -- I need to check fuel regulator.

Anything else that would cause a cold hard start?

I've replaced Fuel Pump, Cam and Crank sensors and Idle air valve.

I’ve replaced the Crank Sensor Connector, as it fell apart.

I now have the car in the garage with instruments ready to go. What do I aim at?
 
RE: Runs Rich; No CE Codes

Replaced it. Sorry I forgot to add that to my list. We also cleaned and re-oiled the K&N air filter -- which reminds me -- I need to see if I contaminated the MAS with the excessive oiling of the filter.
 
RE: Runs Rich; No CE Codes

Another update: I just ran a KOEO and KOER test. No codes.It told me it counted all the pistons.
 
RE: Runs Rich; No CE Codes

Check for fuel pressure with and without vacuum connected to the pressure regulator. Check vacuum at the line going to the pressure regulator. Like the previous post said, the pressure regulator could have a bad diaphragm.

You should have higher pressure with the vacuum disconnected, lower pressure with the vacuum applied. The return line may be restricted causing higher than normal fuel pressure as well.
 
RE: Runs Rich; No CE Codes

Ok, thanks, I'll check the pressures tonight.

FYI -- When I replaced the IACV, I found a broken vacuum line on the fuel regulator. I shoved it back into the regulator's vacuum input hose. At the time, the vacuum hose didn't seem to make much difference being in or out (other than the vacuum leak.)
 
Did you check for vacuum leaks? PCM may be compensating for too much air.....especially at the rear of the IMRC rails.

Just a thought.....
 
I have confirmed The pressures change with vacuum or not. The "rich" rumor came about because of the raw gasoline smell when attempting to start.
 
BTW, the fuel pressure regulator diaphragm is very easy to test. Just take the vacuum hose off and sniff it. If it smells like gas, it's bad.
 
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