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Running so rich I could run to trucks off the exhaust


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First I have an 1987 2.5 manual sportruck with 206000 or more miles on it

 

I have finnaly decided that I need to fix a problem with my motor instead of doing some other projects. I have been running semi rich since i got the truck 6 years or longer ago but havent tracked down the problem. I have a bad IAC motor (the thing on the front of the TB at the linkage that adjust your Idle I think) but that shouldnt cause me problems driving down the road. I am thinking CPS but i don't know for sure, or what about the O2 sensor which was changed when i first got the truck, I have checked all vaccum lines and cleaned the entire TB and injector (TBI Motor if you didnt know).

I have seen a post on this but never caught what motor and when I searched for it today 50 pages came up of posts and I didnt want to look through them. I have no clue other than what was mentioned as to what it might be OR i am looking over something simple it could be.

let me know what you guys think

Thanks

 

Cole

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OK after an hour of searching I have found the post. It was the one aemsee was talking about the MAP sensor and I think thats the problem. Pete I have cleaned every peice of the TB including the injector and check it and it sprayed a fine mist cone so its good.

 

Now one more question.. I know some of you 2.5 guys and 4.0 guys have done some vaccum line work so here's my question. My 2.5 has a stupid block that the lines pass thru next to the TB. Can this block be eliminated or does it do something special???? I broke a line on it while checking lines today and now I want to remove it so I can fix all the lines properly.

 

Cole

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Ill look into that if it stops raining today. Is there a voltage reading that should be good or how should I test it.

 

Cole

you'll need a fuel presure guage that goes up to 50 psi at least.

I'm not sure what your 2.5 is supposed to have, but on the 4.0 of the renix flavor it should read 31 PSI with the vacuum line connected and 39 PSI without.

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Fuel pressure should be 14.5 psi. The FSM claims the regulator is adjustable via a torx screw on the underside, but I could find no such thing on my TB :nuts: in the past when I was trying to diagnose an intermittent stumbling problem (turned out to be the O2 sensor anyways). Lemme see if I can figure out how to post the pic from the FSM that shows the "adjustmet" thingy.....

 

Jeff

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Fuel pressure should be 14.5 psi. The FSM claims the regulator is adjustable via a torx screw on the underside, but I could find no such thing on my TB :nuts: in the past when I was trying to diagnose an intermittent stumbling problem (turned out to be the O2 sensor anyways). Lemme see if I can figure out how to post the pic from the FSM that shows the "adjustmet" thingy.....

 

Jeff

well, that's good to know. Must be lower because it's only got to feed one injector.

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just one injector.

 

Here's the pic from the FSM:

 

Image Not Found

 

Remove air filter elbow and hose. Connect

tachometer leads to diagnostic connector D1, attaching negative lead

to terminal D1-3 and positive lead to terminal D1-1. See Fig. 4.

Remove screw plug and install fuel pressure test fitting.

NOTE: Fuel pressure test fitting is not included with throttle

body. Fitting (8983 501 572) must be obtained separately.

 

2) Connect fuel pressure gauge to test fitting. Start engine

and increase speed to approximately 2000 RPM. Turn Torx head screw at

bottom of regulator to set correct pressure. Turning screw inward

increases pressure and turning screw outward decreases pressure. See

Fig. 3.

 

3) All models require fuel pressure of 14.5 psi (1.0 kg/cm

 

Like I said, I didn't find any type of adjustment screw on mine. YMMV :D

 

Jeff

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Ok I think aemsee is right but has anyone done it. And if not does anyone want to confirm the lines just pass straight through without doing anything spectacular.....I am planning to work on the truck in the morning since i got off work to do it. :brows: so let me know what you guys think about removal of this item plus i discovered 2 lines are cracked on it anyways.

:roll:

Cole

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OK the MAP sensor seems to be working when i unplug the vac line and stop the leak the motor dies ???immediatly??? but I could get my volt meter to work I think I have a bad lead. Anyways I removed the block for the vac lines that i was asking about earlier and bam it cleared alot of the Rich idle up but not all of it. I think the Vac lines for the EGR and a couple others were cracked?? I also looked at my injector And it was spraying jjust as pretty as before BUT is it suposed to coat the butterfly in fuel or should it not spray so much at idle cause it seemed like alot. I have to get a fuel pressure tester and see if thats right and BTW I found that adjustment screw thing on the regulator. jamminz.gif

If anyone has anymore ideas I would greatly appreciate them

 

Cole

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