Pleae HELP!!!!!
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Senior User
Joined: Jul 2001
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Pleae HELP!!!!!
Ok here is my problem. I have 1991 F150, 302, 4x4, 5 speed mazda. The truck barely wants to idle, very shaky and rough, when in gear it only goes about 5 mph and its a very sketchy 5mph. I also get some smoke coming out of the exhaust.
Now this problem just popped up the other day. I let the truck sit a day and it went away. Ran great for about a week or two and now its back. I checked all the plugs and wires and they all look great.
So, I have no clue what it is. I pulled the codes and all I get is a 72 and a 41, MAP sensor and temp sensor. I checked the temp sensor and it checks out good (engine was cold when I did the test). As for the map sensor I get 5 volts on the ref. but only 2.59 on the signal. I don't have a tack meter to checkthe frequency.
So any help is greatly appreciated!!!
Now this problem just popped up the other day. I let the truck sit a day and it went away. Ran great for about a week or two and now its back. I checked all the plugs and wires and they all look great.
So, I have no clue what it is. I pulled the codes and all I get is a 72 and a 41, MAP sensor and temp sensor. I checked the temp sensor and it checks out good (engine was cold when I did the test). As for the map sensor I get 5 volts on the ref. but only 2.59 on the signal. I don't have a tack meter to checkthe frequency.
So any help is greatly appreciated!!!
Elder User
Joined: Dec 2000
Posts: 714
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From: Georgia
Pleae HELP!!!!!
I've had to replace the MAP sensor on my Bronco. It would stall out if you didn't keep your foot on the gas and you could feel it missing as you drove down the road...From what I can remember it wasn't a lot of money. I think it was about $20 or $30 (US) and about a 5 min. fix. You just remove two screws, one vacuum line and one electrial connection.
If you don't already know, the MAP sensor is on the firewall on the pass. side and is about the size and shape of a deck of playing cards.
Hope this helps and does not confuse you more...
Jon
1989 F-150 XL- 4x4, 302, M50D
1995 Bronco Eddie Bauer- 351W, E40D
Finally got around to creating a gallery...check it out
If you don't already know, the MAP sensor is on the firewall on the pass. side and is about the size and shape of a deck of playing cards.
Hope this helps and does not confuse you more...
Jon
1989 F-150 XL- 4x4, 302, M50D
1995 Bronco Eddie Bauer- 351W, E40D
Finally got around to creating a gallery...check it out
Thread Starter
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Senior User
Joined: Jul 2001
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Pleae HELP!!!!!
Well here is where I stand now. I have replaced all the plug wires, cap, rotor, and plugs. I checked the coil and that test out ok. I also check the power going into the tfi module and that ok also.It will run but very bad. I sprayed water on the headers and the number 1,4,5,8 cylinders it turns to steam, but on the inside two cylinders (2,3,6,7) the pipe stays wet.
If I pull a plug it is soaked. The spark also looks alittle weak on that cylinder. So I am thinking, somthing to do with the injector?? Distributor (I tried a spare and the samething)?? or ???
PLEASE HELP! I am going insane here
If I pull a plug it is soaked. The spark also looks alittle weak on that cylinder. So I am thinking, somthing to do with the injector?? Distributor (I tried a spare and the samething)?? or ???
PLEASE HELP! I am going insane here
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