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  #1  
Old 05-19-2010, 10:35 PM
tiemann66 tiemann66 is offline
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Angry I need help! 1989 2.9 v6

Hey all!
I have an 89 ranger 2.9 5spd manul with 231k on it and I have exuasted all my skills and favores to solve the problem. Here is my problem. I have a stumble hiccup and or stall and it is only under load until tonight. The problem started about a month ago. When I take off it felt like i was hit from behind and over time it has gotten worse. My truck bucks horribly under load (mostly starting from a stop). now when I floor it (in 1st 2nd or 3rd) it might stumble once or twice and then take off like a bat out of hell. When I am crusing in 4th or 5th and floor it my truck only stumbles moderitly. As of tonight when I tried to check the TFI Module (ICM) on my distributor wich i was unsuccesful cuase i didn't want to remove my plunum to get at it. My problem also started to hapen with out a load (under idle and reving it). Found this out when I was using a timing light to check my timing and also checking to see if i had a miss. With pip plug remove timing is spot on at 10deg. This has me utterly baffelled!

this is what i have done to date:

New cap and rotor
new wires
new plugs (nothing wrong with old plugs)
2 (used) but working spare coils
Checked IAT sensore and to spec
Checked ECT sensore for eec-iv and to spec
TP sensore (one morning i touched the plug on the tp sensore and truck died. so replace tp sensore and tp senore plug cuase plug had broken tang)
Back probed O2 sensore and as far as i can tell checs out. (when i cuased vaccume leak (lean state) voltage went up to about .5 or .6 and when i disconected fule regulator (rich state) voltage when't to around .2 volts (I could be backwards on direction of voltage for this test as it is from memmory) At idle voltage hung out around .3 volts. so from research i did this seems to be normal with a normal digital volt meter.
Fule presure good and does not change one bit during hiccup. (had gauge in cab with me for a test drive and also for high speed test)
High speed test as far as i can tell checked out ( fuel regulator test(fuel regulator disconected from vaccume))
New fuel filter
Injectors ohm out at about with in .2 ohms of each other and where to spec. think it was right at 15 ohms but know i was right in the middle of what my book said.
Third set of injectors in truck and this set is about 2 to 3 years old
fule pump primes like it should.
fule pump is only about 5 to 6 years old but doesn't rule it out.
Oh and with an analog volt meter and koer or koeo test the eec-iv gives pass code 11 with no stored error codes exept for the tp sensor i messed with that one morning.

I think that about covers it. I have owned this truck for about 7 years and put 112k of the 231k miles on it and have been pretty good with upkeep and repairing problems. I found injectore problems with it in the past and fixed it. This truck still gets around 19 to 20 MPG wich is great for 231k miles. I can not afford to take it in to th shop right now to have it checked. please help!
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  #2  
Old 05-26-2010, 04:14 PM
tiemann66 tiemann66 is offline
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Default Re: I need help! 1989 2.9 v6

Sense this post I have replaced TFI, IAT, ECT, ECM Distributor and did a compression test and still no such luck. I did see on another post that someone had the same problem as me and his roblem was an EGR sensor but unfortiantly I dodn't have an EGR system in my truck. (not CA emissions) My next steps are to do the IAC and MAP. If anyone has any other ideas i am all game for any advise.
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  #3  
Old 05-27-2010, 10:56 AM
tiemann66 tiemann66 is offline
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Default Re: I need help! 1989 2.9 v6

Also changed the IAC and MAP still no change. Maybe it is a fule problem. ues I may have to check the injectors.
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  #4  
Old 05-30-2010, 09:12 AM
86FordRanger 86FordRanger is offline
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Default Re: I need help! 1989 2.9 v6

I have an 86 ranger extend cab with the same problem, i've replaced both fuel pumps and the presure regulator and i've had someone hook up a scan tool to it but it said everything was fine but i think the tool was to new for it, i know its some electrical gremlin i just haven't found it yet
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  #5  
Old 05-30-2010, 10:10 AM
Psychopete Psychopete is offline
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Default Re: I need help! 1989 2.9 v6

I am not sure what I would in this case, but the problem could be caused by a lot of different things. I would be tempted to clean grounds, problem is finding them all, but an EVTM will show you where they are. Was your pressure in spec when you checked it?

Have to tried to clear cm codes (disconnect while cm codes are being output) and drive / test again to verify that the TPS CM code isn't persistent?

I know you said you replaced the tps sensor plug and sensor, did you happen to test the reference voltage and do analog meter sweep test? You can usually fit a set of meter leads in the back of the plug. Ref should be around 5 volts, one is a ground, and the other is the voltage to the computer.

Might also do a vacuum test. When you have a load, or give the throttle more juice, there's going to be changes in vacuum. A bad vacuum line, vacuum leak, poor engine vacuum can all have an effect on how the MAP sensor is feeding to the computer.

This site also has a ton of information that you might find useful:

http://www.fordfuelinjection.com/
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  #6  
Old 06-01-2010, 10:51 AM
tiemann66 tiemann66 is offline
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Default Re: I need help! 1989 2.9 v6

Did some checking on it this weekend with some break clean to see if i had a vacume leak but there is none so my friend and i played with all the electrical conections and then whent for a drive and could bearly get it to act up. you could feel very very small hiccups while crusing in 4 or 5 gear but very minor. so drove in to work to day and after 35 miles of no problems it finaly hiccuped once and that was it. am pretty confidant that it is some sort of wireing problem. So grounds here I come. Thank you everyone for your input.
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  #7  
Old 06-01-2010, 11:09 AM
Psychopete Psychopete is offline
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Default Re: I need help! 1989 2.9 v6

These problems suck when it comes to working with EFI LOL. Just a heads up that the coil plug is notorious for being stubborn. The contacts corroded in the plug and coil on mine, but gave slightly different symptoms. Basically would die whenever the hood was shut, and would hic-up at times. Found it by jiggling plugs until the engine behaved differently.
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  #8  
Old 06-01-2010, 12:44 PM
tiemann66 tiemann66 is offline
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Default Re: I need help! 1989 2.9 v6

forgot to mention that my father in law and i put spark testers inline of the plugs on 4 of the 6 cylinders and had him watch as i put the engine under load with e-break and didn't have any misses. we where baffaled. I may also take all my spare parts that came out of my truck and have them tested even the ecm (EEC-iv).
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  #9  
Old 08-09-2010, 09:45 AM
camador camador is offline
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Default Re: I need help! 1989 2.9 v6

Lil' Beast has similar problem, it hestiates under load but is worse when is cold, it had very bad idle (500 rpm and rough) days ago, I just threw into the gas tank a bottle of 3M Fuel Injector Cleaner and it smothed a little, but still idling low, and when I changed to D it hestiated and sometimes simply recovered to 500 rpm, other dont and idle at 300 rpm without stalling for a while, then stalled or simply recovered back to 500 rpm.

Yesterday, I searched this forum for a possible solution but, thought that it was the EGR valve stuck open and just digged under the hood, but, couldn't find it, I simply removed the IAC and put it apart, cleaned with some carb cleaner then assembled it back, and finaly, woke Lil' Beast up and voilá, it idled at 1,000 rpm when cold, once it's warm it idles at 700~800 rpm, well I solved one issue.

It hestiated for a second then kicked up when I floor the gas, I think fuel injectors were clogged or something then checked the fuel filter, damn, I couldn't blow through it, replaced it and Lil' Beast purrs like a kitten now when idling or at cruise speed.

Still hestiating for a second when press the gas pedal for a second then kicks up and runs like an unlesahed horse, the next weekend anti-stress therapy will be:
1) Replace the spark plugs, I've always used Autolite on it, which ones recommend ?
2) Replace spark plugs cables
3) Replace air filter (will try to get a K&N)
4) Try to clean throttle body
5) Last but not least, will try to take off fuel injectors and take them to the shop for a clean up
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  #10  
Old 10-09-2010, 11:15 PM
art47 art47 is offline
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Default Re: I need help! 1989 2.9 v6

Same prob with my '89 Hesitates for a sec or two coming off idle.
will watch this thread for a possible solution
let you know if I discover something
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1989 XLT 4x4
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  #11  
Old 03-06-2011, 06:37 PM
expidition200 expidition200 is offline
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Default Re: I need help! 1989 2.9 v6

I have 89 runs good for about 30 miles then starts jerking and bucking, but if i put the peddle to the floor it goes away. Pulled off vacum hose and gas was coming out could this be a problem? Thanks in advance!
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  #12  
Old 03-07-2011, 06:21 AM
Psychopete Psychopete is offline
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Default Re: I need help! 1989 2.9 v6

Yes, gas in a vacuum line is a problem. Which one is it?
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  #13  
Old 03-07-2011, 06:43 AM
expidition200 expidition200 is offline
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Default Re: I need help! 1989 2.9 v6

gas pressure regulator

Last edited by expidition200; 03-07-2011 at 06:58 AM.
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  #14  
Old 03-07-2011, 09:48 AM
camador camador is offline
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Default Re: I need help! 1989 2.9 v6

Well I finally did all to "Little Beast" (got a new air filter but no K&N brand) it ran great, just like if it had a new engine, worked fine for a couple of months, then it got another issue:

Oil into the radiator !!

I think it has a blown gasket or a cracked head, have never overheated, is there any "temporal" solution for it while I save for a full engine repair ?

By the way, there is no water into the engine oil, just oil in the radiator !

Thanks in advance for any advice.

Cheers from southern Baja !
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  #15  
Old 03-07-2011, 09:53 AM
Psychopete Psychopete is offline
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Default Re: I need help! 1989 2.9 v6

Quote:
Originally Posted by expidition200 View Post
gas pressure regulator
Yes, the fuel pressure reulator diaphram has ruptured. Gas is leaking right into the upper intake manifold. Be sure to change oil and check #6 plug. Closest to the FPR vacuum nipple so the back cylinders are front in line to suck in all of that leaking gas.

camador - too much going on in this thread. Any chance I could talk you into starting a new one with all of the symptoms youre having? I think you will get far better responses with everything wrapped up in one thread.
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