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June 23, 2018, 05:18:48 AM

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Author Topic: 89/90 F250 stalling  (Read 1063 times)
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Gr8Dain
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« Reply #45 on: May 25, 2018, 12:12:49 PM »

Thanks Garner.

And my head hurts too. I was getting different numbers a couple times. What a PITA

So I am going to see how to solve the MAP signal issue.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
RattleTrap55
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84 CJ7
« Reply #46 on: May 25, 2018, 12:39:05 PM »

Test your MAP sensor to verify that it is the senor and not the vacuum line or electrical connections. A map sensor for Ford, Chevy, or a Jeep are all about the same. All you need is multi-meter and some way to draw a vacuum (you have a brake bleeder).

Check out this link:
http://www.fixjeeps.com/map-sensor.html

Below are the Ford specific specs:

The Ford Manifold Absolute Pressure sensor found on all speed density
equipped vehicles has the following properties:

Pinout

Pin 1 is nearest the pressure orfice.

1   +5v
2   Signal out
3   Sig Return (GND)

The pressure vs frequency values are:

in-Hg   kPa   Hz
0   0   159
3   10.2   150
6   20.3   141
9   30.5   133
12   40.6   125
15   50.8   117
18   61.0   109
21   71.1   102
24   81.3   95
27   91.5   88
30   101.6   80

The accuracy of the sensor is +-3 Hz

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3.5 Lift on 33's
4.2L w/HESCO MFI & Howard Cam
T-5 & Dana 300
Spartan Locker

2018 JKU - box stock
Gr8Dain
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« Reply #47 on: May 25, 2018, 12:43:20 PM »

Thanks Garner.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
Gr8Dain
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« Reply #48 on: June 03, 2018, 04:26:45 PM »

Drove the beast to Chantilly to get a new washing machine today. That was a stressful drive. Between stalling and random bucking and not shifting at points it should have (and the tranny code) I think I need to take it somewhere from transmission work at least.

Any suggestions?

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
majestek12
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« Reply #49 on: June 04, 2018, 06:36:43 AM »

The shifting problems may be related to the engine problems you're having. I would look into those before spending money on the transmission myself, as long as you don't have to drive it too much. That model year should have an AOD transmission, which is known for having issues with the throttke valve cable. Holding onto gears too long is a common symptom. Sometimes it needs to be replaced but often it can just be adjusted. There are forum threads and links that should tell you how to do so.

If you do take it into a shop County Transmission in Vienna is always my go-to, but I know that may be hard for you to get it there.
« Last Edit: June 04, 2018, 06:40:37 AM by majestek12 »

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Gr8Dain
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« Reply #50 on: June 04, 2018, 08:00:46 AM »

The shifting problems may be related to the engine problems you're having. I would look into those before spending money on the transmission myself, as long as you don't have to drive it too much. That model year should have an AOD transmission, which is known for having issues with the throttke valve cable. Holding onto gears too long is a common symptom. Sometimes it needs to be replaced but often it can just be adjusted. There are forum threads and links that should tell you how to do so.

If you do take it into a shop County Transmission in Vienna is always my go-to, but I know that may be hard for you to get it there.

Thanks. And it is not a DD, so I have some time. But I would like to take it to Camp Heep in July.

I will look into the throttle cable issue as well. I just hate swapping parts and hoping. So I want to find someone who has seen this before. I also donít want to throw money away on shops to guess the fix as well. Sigh. I am just really frustrated right now.

Thanks again.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
Gr8Dain
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« Reply #51 on: June 10, 2018, 11:10:04 AM »

Yesterday I used it to take a load of branches and a washing machine to the dump. Of course it stalled and bucked a lot.

Got home and put the fuel pressure gauge on it. It read consistently 38 even when it stalled. So it does not appear to be a fuel delivery issue.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
majestek12
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« Reply #52 on: June 10, 2018, 12:14:54 PM »

Look into the EGR and adjusting the TV cable on the transmission. Both can cause exactly these symptoms.

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Clifford04X
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« Reply #53 on: June 10, 2018, 04:10:02 PM »

Im guessing you haven't replaced the distributor yet?  Hopefully you put electrical grease on the back side of the module or you'll be replacing it again soon

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04 TJ, 5.5" Clayton long arm, Waggy 44 front, 8.8 Rear, 5.13's, Lockers, NP241OR, 36 iroks, Allied beadlocks, Hydro assist, Warn bumpers/sliders, M8000 winch.
Gr8Dain
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« Reply #54 on: June 10, 2018, 06:01:20 PM »

Im guessing you haven't replaced the distributor yet?  Hopefully you put electrical grease on the back side of the module or you'll be replacing it again soon

No to the distributor and yes to the grease

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
Clifford04X
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« Reply #55 on: June 10, 2018, 06:16:30 PM »

the bucking/jerking is most likely a random misfire.  And seeing that it stalls completely it's probably losing all spark.  You could replace just the stater but it's a pain pressing on and off the gear.  Last few that I've done at the shop I got a whole unit cap rotor and all from carquest.  I think they were only $150 bucks.  Since your module is mounted on the distrutor it's an open bowl.

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04 TJ, 5.5" Clayton long arm, Waggy 44 front, 8.8 Rear, 5.13's, Lockers, NP241OR, 36 iroks, Allied beadlocks, Hydro assist, Warn bumpers/sliders, M8000 winch.
Gr8Dain
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« Reply #56 on: June 10, 2018, 06:29:37 PM »

the bucking/jerking is most likely a random misfire.  And seeing that it stalls completely it's probably losing all spark.  You could replace just the stater but it's a pain pressing on and off the gear.  Last few that I've done at the shop I got a whole unit cap rotor and all from carquest.  I think they were only $150 bucks.  Since your module is mounted on the distrutor it's an open bowl.

Ok. Thanks. I will check spark and look into a distributor

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
Gr8Dain
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I HATE RUST!!!!!
« Reply #57 on: June 10, 2018, 06:30:49 PM »

Look into the EGR and adjusting the TV cable on the transmission. Both can cause exactly these symptoms.

Thanks. I will look i to those. I think I replaced the egr already. I will check.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
Ose
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Quality Performance
« Reply #58 on: June 12, 2018, 01:19:18 PM »

Replace your TFI. Those things are very fickle to heat and can cause your issue. I believe your truck will have it mounted to the drivers side fender underneath the OBD test port, if its not there check the side of the distributor.

Make sure when you buy a replacement that its the same color as the one that came out. There are only black and grey but they are not interchangeable. I always keep a spare with me because I've baked them many times.


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Gr8Dain
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« Reply #59 on: June 12, 2018, 02:34:29 PM »

Replace your TFI. Those things are very fickle to heat and can cause your issue. I believe your truck will have it mounted to the drivers side fender underneath the OBD test port, if its not there check the side of the distributor.

Make sure when you buy a replacement that its the same color as the one that came out. There are only black and grey but they are not interchangeable. I always keep a spare with me because I've baked them many times.

That was the first thing I replaced. And it is on the distributor. Ugh.

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Dain

1984 CJ-8 Scrambler
3.5" lift
DD and trail toy

2015 JKU - Completely stock - Family mobile
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