Won’t go past 3000 rpm
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Joined: Aug 2018
Posts: 2
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From: Dover, pa
Won’t go past 3000 rpm
i have a 2002 ford ranger 4.0 it has 167xxx miles on it and it will not rev past 3000 rpms in park neutral drive or reverse I have no clue what the problem is I just bought this truck and it has been barley driven in the past 6 months any help would be very appreciated
Welcome to the forum
All computer controlled engines will have a REV Limiter, usually set at 3,000rpm
This is active ONLY in Park or Neutral on an automatic, or if clutch pedal is down on manuals
2002 automatic will have a DTR sensor on the transmission linkage, drivers side, DTR(Digital Transmission Range) sensor tells the computer what gear the driver has selected, and this is where the Park/Neutral selection will come from
If DTR sensor has a problem CEL(check engine light) should come on and there will be a code for this
Does the CEL work?
It should come on with the key on and then go off after startup
If so then DTR sensor is probably OK
A dirty Fuel filter can limit speed/RPMs, not expensive or hard to change, $10-$15 and they should be changed every 5 years
Next would be exhaust blockage, any engine is an air pump, if old air can't get out then new air can't get in, simple as that.
Check tail pipe flow while some one REVs engine, you can usually tell if exhaust flow is not increasing past a certain point.
Or use a Vacuum gauge to test for exhaust blockage.
All computer controlled engines will have a REV Limiter, usually set at 3,000rpm
This is active ONLY in Park or Neutral on an automatic, or if clutch pedal is down on manuals
2002 automatic will have a DTR sensor on the transmission linkage, drivers side, DTR(Digital Transmission Range) sensor tells the computer what gear the driver has selected, and this is where the Park/Neutral selection will come from
If DTR sensor has a problem CEL(check engine light) should come on and there will be a code for this
Does the CEL work?
It should come on with the key on and then go off after startup
If so then DTR sensor is probably OK
A dirty Fuel filter can limit speed/RPMs, not expensive or hard to change, $10-$15 and they should be changed every 5 years
Next would be exhaust blockage, any engine is an air pump, if old air can't get out then new air can't get in, simple as that.
Check tail pipe flow while some one REVs engine, you can usually tell if exhaust flow is not increasing past a certain point.
Or use a Vacuum gauge to test for exhaust blockage.
RF's Exiled Elite
Joined: Dec 2017
Posts: 553
Likes: 5
From: Kentucky
Is it bouncing exactly at 3,000 (getting to 3k easily, stopping for a second, then reving back to 3k and repeating) or is it getting to 3k and just losing power until it wont rev anymore?
If its bouncing it is definitely the rev limiter kicking on when it shouldnt. As a backwards test... will the starter engage with the truck in drive? Obviously dont try this with anything in front of you and your foot not on the brake.
If its bouncing it is definitely the rev limiter kicking on when it shouldnt. As a backwards test... will the starter engage with the truck in drive? Obviously dont try this with anything in front of you and your foot not on the brake.
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