bad idle bogs down on acceleration
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New User
Joined: Apr 2004
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bad idle bogs down on acceleration
Last week went out to start my 1998 b4000 4.0 with no joy. Had it towed to shop they found a bad crankshift senser. (where is that). Ran rough but i went on a trip. Around 100 miles in the trip truck started to hesitated bad. Got the truck home found the vacum hoses leading to the DPSE were bad. Also had melted my spark plug wires where the hole in the vacum line had blown on in. R2 the dpse and the spark plug wires. Still very rough. Engine chucks at low speeds and seems to smooth out at 2500 RPMs. HAs stalled while in idle but not all the time. Disconnected IAC and engine stalled disconnected vacum hose leading to engine and seemed to smooth out. Any ideals? Did not have this problem before they changed the crankshaft senser.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Welcome to FTE!
On account of what's already occured, I would change out your spark plugs, they probably took a beating, as well. I'm assuming you replaced the bad wires already.
The crankshaft positon sensor is a 15 minute job to replace on the 4.0L. It's located down near the large, main engine pulley in the front of the engine. You might consider taking it off and trying another one, or at least cleaning the terminals on the harness connector. However, I would think that the motor would run lousy all the time and/or not start at all with a bad CKP, so the fact that it ran well for 100 miles after replacing the old one makes me believe it's not a bad sensor.
When you disconnect a vacuum hose to the upper intake at idle, you allow a boatload of air into the engine, and it should struggle and/or die, not smooth out.
I recommend you pick up a Haynes Manual for the '93-'00 Ranger, worth the 15 bucks.
On account of what's already occured, I would change out your spark plugs, they probably took a beating, as well. I'm assuming you replaced the bad wires already.
The crankshaft positon sensor is a 15 minute job to replace on the 4.0L. It's located down near the large, main engine pulley in the front of the engine. You might consider taking it off and trying another one, or at least cleaning the terminals on the harness connector. However, I would think that the motor would run lousy all the time and/or not start at all with a bad CKP, so the fact that it ran well for 100 miles after replacing the old one makes me believe it's not a bad sensor.
When you disconnect a vacuum hose to the upper intake at idle, you allow a boatload of air into the engine, and it should struggle and/or die, not smooth out.
I recommend you pick up a Haynes Manual for the '93-'00 Ranger, worth the 15 bucks.
Elder User
Joined: Aug 2003
Posts: 694
Likes: 0
From: formerly Brooklyn NY now
I would also pull codes and see where that gets ya and also after you get any codes out of the computer id also clear all codes and see what happens
like the other poster said you changed out the wires and the screwed up hose and you need to change out the plugs too
after you do that, get back to us
like the other poster said you changed out the wires and the screwed up hose and you need to change out the plugs too
after you do that, get back to us
