What's up?

I'm neew here as some of you veterans may have noticed.

Anyway, I've got this problem with my truck, actually it's a reoccuring problem that is starting to make me mad.

There was a thread a little while ago that I was reading. It was all about the same problem, except your trucks were all 8-10yrs newer.

The problem is this. About once a year I have to replace the mapping sensor on my '88 F150, 302. Now that wouldn't seem that bad but after about 6 months it decides to act up about once a month.

WQhat it does is just run rough. When I step on the clutch it'll almost die then continue to bring the rpms up then drop agian until you even it out with the pedal.

When it needs changing there is no steadying the rpm's with the pedal. While driving you can feel it jerking. Trying to speed up and slow down again. Then you let of the gas and it will stall. It kinda evens out when you floor it yet it is a guttless wonder when this is all happening

Any help or advice would be helpful

Thanx

 

the best thing to do is buy a 2001 5.4.trade in that 88.the new truck are a new breed.way more power.buy the way nice to have you on the ford boat.

 

Oh man. How I would love to do that. The only prob is being 17 I'm a little short on the cash side and without a nice secure job, there is no chance of a loan

 

I had about the same problem on an '89 F-150 w/ 5.0. Mine idled up then down then up again while the clutch was pushed in. When you would go to stop it would die. A few things to check could be the throttle position sensor, idle air control seleniod, and the the rear EGR valve. The main problem on mine was the rear EGR valve. It's near the end of block on top next to the intake (i think).
Hope this will help.


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My 2000 F-150

If it looks good
you'll see it
If it sounds good
you'll hear it
If it's marketed right
you'll buy it
But..if it's real
you'll feel it

 

Speaking as a "old' ford fan, and backyard mechanic.

it almost sounds like you have surging and hesitation. This is very common with early efi fords.

You should have your fuel injectors pressure cleaned and clean your throttle body. IT also does sound like your TPs is going out. I think what spargo2 is calling the 'rear egr' is actually the knock sensor, it is in fact on top of the upper intake.


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toydestroyer1@yahoo.com

"Sleeper"


1993 F-150 302/e4od/355 Limited slip. dual exhuast w/o mufflers, 2 1/4" pipes, Echo Tips, Summit Racing headers, MSd Wires/Motorcraft Plugs, hypertech powermodule, 4 degree advance,Blaster Coil,MSd 6A Ignition, TPS Mod,5% dark tint, Ford Bed mat, Bundy Chrome Drop bumper, Wrap-around bug deflector, 2-tone tan/brown. Alpine cd player and Pioneer speakers, with tweeters No room for anything else.

1989 F-150 XLT 4x4 302/Aod MM hubs, true duals with turbo mufflers, maroon/grey middle, est 200hp

 

If your oxygen sensor isn't within specs, fuel vapors can build up in the intake and damage the MAP sensor. Just a guess, though.

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Model: '99 F150 Lariat Supercab 4x4 SS Mechs: 5.4L, 3.73 Diff (9.75" LSD Rear, 8.8" Front)
ORP: Skid Plates, LT265/70R17 GY Wrang. AT/S
Group III towing: HD Electrical/Cooling, GVWR 6500# (Extra leaf spring).
Stuff: Step Bars, 4W Disc ABS, K&N filter, 0W-30 Series 2k Amsoil @ 8200 miles
Stock Items That Differ Across F150s: Steel Driveshaft, Oil filter bolted to engine w/ drip guard, 4R70W transmission.

 

Guys,
I've had several MAP (manifold air pressure) equipped vehicles & never had one go bad. I thought one was bad, but that turned out to be EGO. The intake carbon & fuel vapors have no access as the MAP mounts on the firewall with some wires & a vacume line plugged in. I guess if one does go bad, it would be like loosing manifold vacume.

 

Ya, I was reading and starting to believe it was the TPS, but when i take it to the shop, they get the code for the mapping sensor.

Thanx.

A friends dad works at a local dealer. He said he'd take it in after hours and take a little better look at it for me.