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Re: idle fuel mixture adjustment [Re: Frank Torres] #780971 01/19/07 03:37 PM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Quote
There is no MAF on your 22re.

You have a Air Flow Meter. And it is BEST to leave it alone...

The TPS advances the timing when you hit the throttle, just above idle.
Check your timing- at IDLE, timing at 7* and at 2000rpm about 14*.

For your smog test;
Pulling the spark plugs and making sure the whole ignition system is working good.
The EFI is pretty much computer controlled all the components need to be working for the system to preform like it should.
Sounds like you have a RICH unburnt fuel condition...something is not right.

Low fuel pressure will spit gas into the cylinders instead of mist and cause a rich condition.
A bad water temp sensor will also cause a slight rich condition...

...anyway I'll end my ranting.

Good luck and keep us posted



Quote
Low fuel pressure will spit gas into the cylinders instead of mist and cause a rich condition.

There has been more than one reference to low fuel pressure as being a possible contributor.

I have tested the fuel pump by shorting the terminals F(p) and +B as depicted on page FI-43 of my FSM and detected the 'gurgling' sound of the fuel flowing thru the piping.

If low fuel pressure was a contributor wouldn't other symtoms surface elsewhere also?

The manual shows using some Special Service Tool (SST) for testing the fuel pressure at the fuel injector. Since I don't have a tool I have yet to go down this path.

But I do seem to recall reading on this site, someone attaching a gauge somewhere else. Someone out there with a better memory than mine?

Quote
A bad water temp sensor will also cause a slight rich condition...


I have replaced the Water Thermo Sensor. The Cold Start Injector Time Switch tested (ohm meter) within range.

I assume you are referring to one of these two sensors located below the throttle body.

From the Off-Road World
Re: idle fuel mixture adjustment [Re: dcs14] #780972 01/19/07 10:39 PM
Joined: Jul 2006
Posts: 139
VanillaTHUNDA Offline
Wheeler
Quote
Quote
You should be setting your idle at 850rpm to start with for an auto tranny.

I was using the specs. in my Repair Manual (FSM) because it has been the only reference I have.

It calls for an idle of 700 rpm m/t and 750 rpm a/t in the appendix, page A2, and also call for an idle of 750 rpm on page MA-9. What am I missing?


Hmm, my underhood emissions tag calls for 850rpm. If you still have it, I'd reference that.

Re: idle fuel mixture adjustment [Re: VanillaTHUNDA] #780973 01/25/07 03:40 AM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Quote
Hmm, my underhood emissions tag calls for 850rpm. If you still have it, I'd reference that.


After looking again, I do not have an underhood emissions tag. If someone thinks that I just haven't found it, pls advise.


Recently I lost a tag off the front of the valve cover made of a metal-foil like material. But I think that just read "22 RE" or something like that.

Now, back on focus:
1) Why choose one particular source for idle rpm?
2) What criteria does one to choose between 750rpm f/ the FSM, v.s. 850rpm from the underhood emissions tag? I'll admit being w/o any info to make that call....

Last edited by dcs14; 01/25/07 03:42 AM.
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