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idle fuel mixture adjustment #780961 01/17/07 06:35 PM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Re: 85 Toy PU, 22RE, 4x4, auto, extra cab, 140k miles, one owner.

After setting my idle speed I ended up with a "rich" odor from the exhaust gases.

Also, in testing my Throttle Position Sensor(TPS) some measurements and procedures failed to match that described in my "85 Toyota Pickup & 4Runner Repair Manual."

Note: My Repair Manual is identical to what is referred to on this site as a FSM (Field Service Manual?) and I have downloaded from this site, although I could not find from where when I looked today. The FSM file downloaded as "toyota4runner.pdf."

The specifics of my idle resetting were:
After setting the "throttle stop screw" (TSS) at 1/4 turn after touching, and setting the idle at 750rpm, I got this "rich" odor from the exhaust gases.

When testing my TPS, between the IDLE and E(2) contacts, my FSM (page FI-62) says that after setting the TSS at 1/4 turn, after contact, there is supposed to be a 'deflection" point from continuity to no-continuity when changing between thickness gauges from one of 0.57 mm to one of 0.85 mm.

Note: Page FI-62 of the FSM is approximately page 229 of my pdf file. (out of a total of 1025 pages)

The deflection point on my TPS occurs at about 1/16th turn of the TSS (after contact) (1/16th turn is as best I can estimate) and without using any thickness gauge.

Also when testing the TPS between the IDLE and E(2) contacts, and prior to the deflection point, I measured resistances from 7K to 13K ohms. The FSM calls for "less than 2.3K ohms."

Note: I can only perform this deflection test with the TSS just barely touching, or I can not detect the deflection point. i.e. all measurements produce no-continuity.

At this point I have adjusted the TSS at approx. 1/16th turn and the idle at 750rpm and get a slightly rich odor. My concern is that I may get whip-sawed at my next smog test.

Any comments on:
1) smog test?
2) testing procedure?
3) path forward?

tks...

From the Off-Road World
Re: idle fuel mixture adjustment [Re: dcs14] #780962 01/17/07 08:29 PM
Joined: May 2005
Posts: 65
C
casper3t Offline
Getting the Wheeling Fever
I'm getting the small problem with my tps too, i'm wondering how to fix that too. is your idle kinda rough too?


Thomas

----------

94 Toyota Pickup 22R-E
EB's Street RV Head with 268* Cam
Re: idle fuel mixture adjustment [Re: casper3t] #780963 01/17/07 10:54 PM
Joined: Oct 2004
Posts: 1,270
willzrunna96 Offline
Body Damage is Cool
you will not beable to get the right mixture with the idle speed if the tps isnt setup properly or let alone working properly...you must get the TPS dialed in then set your idle then just double check your timing...i dont think there is a a/f adjustment without tweaking the MAF. <img src="/forums/images/graemlins/cheers.gif" alt="" />


91 pickup 5.29's US GEAR.35x 12.50 trxus m/t.5 speed swap- SOLD!
96 4Runna limited-toytec/OME lift,diff drop Nitto 285/75/16 Elocked=butter
07 FJ cruiser 3" DR coilovers 285/75/16 nitto TG. allpro sliders
Re: idle fuel mixture adjustment [Re: casper3t] #780964 01/18/07 02:35 AM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Quote
I'm getting the small problem with my tps too, i'm wondering how to fix that too. is your idle kinda rough too?

When I had the TSS adjusted at 1/4 turn and adjusted the idle to 750 rpm, then it kind of floated between 600 and 800.
But with the TSS at about 1/16th turn, the idle adjust stays pretty steady at 750.

Re: idle fuel mixture adjustment [Re: willzrunna96] #780965 01/18/07 02:46 AM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Quote
you will not beable to get the right mixture with the idle speed if the tps isnt setup properly or let alone working properly...you must get the TPS dialed in then set your idle then just double check your timing...i dont think there is a a/f adjustment without tweaking the MAF.


1) I assume a/f is air/fuel.
2) MAF = ?__________?

Re: idle fuel mixture adjustment [Re: dcs14] #780966 01/18/07 04:18 AM
Joined: May 2005
Posts: 65
C
casper3t Offline
Getting the Wheeling Fever
Quote
Quote
you will not beable to get the right mixture with the idle speed if the tps isnt setup properly or let alone working properly...you must get the TPS dialed in then set your idle then just double check your timing...i dont think there is a a/f adjustment without tweaking the MAF.


1) I assume a/f is air/fuel.
2) MAF = ?__________?


MAF = Mass Air Flow


Thomas

----------

94 Toyota Pickup 22R-E
EB's Street RV Head with 268* Cam
Re: idle fuel mixture adjustment [Re: willzrunna96] #780967 01/18/07 02:59 PM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
Quote
you will not be able to get the right mixture with the idle speed if the tps isnt setup properly or let alone working properly...you must get the TPS dialed in then set your idle then just double check your timing...i dont think there is a a/f adjustment without tweaking the MAF.


1) To which piece of equipment, or how, does one 'tweak the MAF'?
2) I failed to locate anything about MAF in my repair manual. Have I missed it, and if yes, where is it located?

Re: idle fuel mixture adjustment [Re: dcs14] #780968 01/18/07 05:59 PM
Joined: Oct 2002
Posts: 153
Frank Torres Offline
Wheeler
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


1991 FJ 80 Land Cruiser for fun.
1998 GS300 for the wife
1998 GS400 for me
1991 Supra SOLD
1986 4Runner 335k miles-22re EB inside.SOLD
Re: idle fuel mixture adjustment [Re: dcs14] #780969 01/18/07 09:02 PM
Joined: Jul 2006
Posts: 139
VanillaTHUNDA Offline
Wheeler
Quote
Re: 85 Toy PU, 22RE, 4x4, auto, extra cab, 140k miles, one owner.

After setting my idle speed I ended up with a "rich" odor from the exhaust gases.

Also, in testing my Throttle Position Sensor(TPS) some measurements and procedures failed to match that described in my "85 Toyota Pickup & 4Runner Repair Manual."

Note: My Repair Manual is identical to what is referred to on this site as a FSM (Field Service Manual?) and I have downloaded from this site, although I could not find from where when I looked today. The FSM file downloaded as "toyota4runner.pdf."

The specifics of my idle resetting were:
After setting the "throttle stop screw" (TSS) at 1/4 turn after touching, and setting the idle at 750rpm, I got this "rich" odor from the exhaust gases.

When testing my TPS, between the IDLE and E(2) contacts, my FSM (page FI-62) says that after setting the TSS at 1/4 turn, after contact, there is supposed to be a 'deflection" point from continuity to no-continuity when changing between thickness gauges from one of 0.57 mm to one of 0.85 mm.

Note: Page FI-62 of the FSM is approximately page 229 of my pdf file. (out of a total of 1025 pages)

The deflection point on my TPS occurs at about 1/16th turn of the TSS (after contact) (1/16th turn is as best I can estimate) and without using any thickness gauge.

Also when testing the TPS between the IDLE and E(2) contacts, and prior to the deflection point, I measured resistances from 7K to 13K ohms. The FSM calls for "less than 2.3K ohms."

Note: I can only perform this deflection test with the TSS just barely touching, or I can not detect the deflection point. i.e. all measurements produce no-continuity.

At this point I have adjusted the TSS at approx. 1/16th turn and the idle at 750rpm and get a slightly rich odor. My concern is that I may get whip-sawed at my next smog test.

Any comments on:
1) smog test?
2) testing procedure?
3) path forward?

tks...



You should be setting your idle at 850rpm to start with for an auto tranny. I agree that the TPS should be dialed in prior to any other idle work being done to it, though I'd also check your auxilury air valve as that can cause the idle and mixture to be thrown off. You may also check your fuel pressure regulator if the other fixes don't work <img src="/forums/images/graemlins/wink.gif" alt="" />

Re: idle fuel mixture adjustment [Re: VanillaTHUNDA] #780970 01/19/07 02:47 PM
Joined: Aug 2006
Posts: 26
D
dcs14 Offline OP
Getting the Wheeling Fever
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?

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