Motor races when rolling in neutral: 92 Dakota
From : john corliss
Q: sorry to keep bothering this group with my questions but im very new to owning a dodge. my friend traded me his 92 dodge dakota for my 71 husky dirt bike bike runs only has 3200 original miles on it last week. what ive noticed with the dakota 2.5l 4 banger five speed tfi 2wd is that although it runs all right otherwise it does two strange things 1. when you first start the motor it races for a few seconds and then slows down to a normal idle. this may be a normal choke sequence i dont know but 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. it doesnt do this when rolling in reverse. to my way of thinking this sounds like some kind of sensor problem like maybe the vehicle speed sensor on the tranny but who knows my friend said that it hasnt always done item 2. does anybody have any idea why this is happening tia -- john corliss .
Replies:
From : john corliss
tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. -- john corliss .
From : tom lawrence
2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts .
From : john corliss
john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss .
From : tbone
2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts ok now you have me curious. with the conditions that he described what do the motor mounts have to do with it -- if at first you dont succeed youre not cut out for skydiving .
From : bill dukenfield
john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. jam .
From : tbone
john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. why -- if at first you dont succeed youre not cut out for skydiving .
From : john corliss
bill dukenfield wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. check the motor mounts. as tom said. ill do it but as tbone asks and out of curiosity... why should have done it the day before yesterday since there was actually a sucker hole in the sky right over my place. -- john corliss .
From : bill dukenfield
tbone wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. why -- if at first you dont succeed youre not cut out for skydiving the truck is 16 years old. its not unreasonable that a motor mount has broken. if a motor mount is broken the motor will rise up on the side that is broken the throttle cable tightens and the motor races. ive seen this twice in the old dodges and plymouths i have owned. jam .
From : tbone
tbone wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. why -- if at first you dont succeed youre not cut out for skydiving the truck is 16 years old. its not unreasonable that a motor mount has broken. while not unreasonable i would also think unlikely but worth a look just the same. if a motor mount is broken the motor will rise up on the side that is broken the throttle cable tightens and the motor races. that is not always true and depends on which motor mount is broken. i cant speak for your vehicles but the cable in my 97 ram is more than long enough to deal with the movement from a broken motor mount and if the engine is really moving that much it should also cause problems with the trans linkage. the op also said that this condition occurs whenever the vehicle is moving both in and out of gear so what would cause the engine to lift at idle under motion and not when sitting still this is why i am curious about this. if it only occured while moving and in gear then this is a much greater possibility but if it also does it in neutral then it is either not the problem or he also has other problems besides a broken motor mount. -- if at first you dont succeed youre not cut out for skydiving .
From : roy
tbone wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. why -- if at first you dont succeed youre not cut out for skydiving the truck is 16 years old. its not unreasonable that a motor mount has broken. while not unreasonable i would also think unlikely but worth a look just the same. at one time gm had such a problem with engine mounts which caused sudden acceleration they did a recall and had a cable installed to stop the engine lift. .
From : nosey
that is not always true and depends on which motor mount is broken. the drivers side mount keeps the engine from lifting. the passenger side mount is under compression. -- ken .
From : john corliss
tbone wrote tbone wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. -- john corliss check the motor mounts. as tom said. why -- if at first you dont succeed youre not cut out for skydiving the truck is 16 years old. its not unreasonable that a motor mount has broken. while not unreasonable i would also think unlikely but worth a look just the same. if a motor mount is broken the motor will rise up on the side that is broken the throttle cable tightens and the motor races. that is not always true and depends on which motor mount is broken. i cant speak for your vehicles but the cable in my 97 ram is more than long enough to deal with the movement from a broken motor mount and if the engine is really moving that much it should also cause problems with the trans linkage. the op also said that this condition occurs whenever the vehicle is moving both in and out of gear so what would cause the engine to lift at idle under motion and not when sitting still this is why i am curious about this. if it only occured while moving and in gear then this is a much greater possibility but if it also does it in neutral then it is either not the problem or he also has other problems besides a broken motor mount. i should have mentioned that the motor was rebuilt by the dealership under warrenty only 80k miles ago. i dont think either they or my friend would allow a broken motor mount to go unrepaired. 80 -- john corliss .
From : john corliss
roy wrote tbone wrote bill dukenfield wrote tbone wrote bill dukenfield wrote john corliss wrote john corliss wrote tom lawrence wrote 2. as soon as the truck starts moving in a forward direction either coasting in neutral or in gear- doesnt matter the motor starts racing a bit again and wont stop doing it until i come to a complete stop. check the motor mounts no i didnt and im afraid ill have to wait a while to do it since were buried in snow here. well its snowing again but i think ill get in the truck and see what computer error codes are loaded if any you turn the key on-off-on-off-on within two seconds and watch the light on the dash flash. check the motor mounts. as tom said. why if at first you dont succeed youre not cut out for skydiving the truck is 16 years old. its not unreasonable that a motor mount has broken. while not unreasonable i would also think unlikely but worth a look just the same. at one time gm had such a problem with engine mounts which caused sudden acceleration they did a recall and had a cable installed to stop the engine lift. i kind of thought that was where you were going with this the motor pulling on the throttle cable but you have to remember that the racing occurs when the truck is in neutral and coasting. also i have my foot off of the pedal. my feeling is that this is some kind of a sensor problem. throttle fuel injection is pretty complex and once i get the error codes out of the computer maybe tomorrow ill post them here and well have a better idea of whats going on. thanks very much for your input though! -- john corliss .