98 RAM Loss of Power - Need real help!
Thread Starter
Joined: Aug 2007
Posts: 13
Likes: 0
RE: 98 RAM Loss of Power
Hi Everyone,
I Replaced the coil, no difference.
I Replaced the TPS, no difference.
I Removed the O2 sensor from the CAT, no difference.
I can spray fuel into the throttle body, no difference.
The fuel pump assy is two weeks old and I have 48psi at the fuel rail while at idle and stays constant as its reved up.
Generates no fault codes.
Runs fine at idle and revs up to about 1500 rpm's before it starts choaking down.
Beats the dog out of me....
I Replaced the coil, no difference.
I Replaced the TPS, no difference.
I Removed the O2 sensor from the CAT, no difference.
I can spray fuel into the throttle body, no difference.
The fuel pump assy is two weeks old and I have 48psi at the fuel rail while at idle and stays constant as its reved up.
Generates no fault codes.
Runs fine at idle and revs up to about 1500 rpm's before it starts choaking down.
Beats the dog out of me....
Veteran
Joined: Apr 2006
Posts: 404
Likes: 0
From: Nova Scotia
RE: 98 RAM Loss of Power
Hi mdelfunt. The first time this happen to me, it was very sudden. I left work and was crossing the bridge over the halifax harbour and half way over, the truck started to bog down. I got a few miles out of town and all I could do was maybe 25-30 mph.
As soon as I would try to accelerate the motor would bog, but the truck would set there and idle, got the truck towed to the dealership and a newconverter was installed under warranty.
The reason the converter went when the truck was fairly new. I had computer problemthat caused the fuel mixture to be very rich and a lot of raw fuel ran thru the converter and caused a premature failure.
Hope this helps
Cheers
Kayakman
1998 QC Ram 360 V8
As soon as I would try to accelerate the motor would bog, but the truck would set there and idle, got the truck towed to the dealership and a newconverter was installed under warranty.
The reason the converter went when the truck was fairly new. I had computer problemthat caused the fuel mixture to be very rich and a lot of raw fuel ran thru the converter and caused a premature failure.
Hope this helps
Cheers
Kayakman
1998 QC Ram 360 V8
Hall Of Fame
Joined: Jul 2006
Posts: 12,204
Likes: 10
From: Gainesville, Ga.
RE: 98 RAM Loss of Power
there are a few more sensors, but just replacing them randomly w/o cause is expensive and silly. you've got MAP, Intake Air Temp, Crank Position, Cam Position.
the air sucking sound you mentioned has got me baffled.
It still sounds like the cat, but if so, generally removing the front o2 sensor will improve things a little bit. not a lot, but a little. you did remove the one before the cat right ? yeah i know you did, but just had to ask.
one last question. when its reving up to the 1300-1400-1500 mark, are you getting good strong exhaust flow ?
a few more random ideas.
do you live anywhere close to a muffler shop where you could limp in and let them check the cat ? as soon as they saw it off, you'll know if that was it or not. if not, just have them weld it back on
or the same thing as do it yourself. take a saws-all and saw the cat loose. if thats not it you'll have to reweld it, or clamp it back together.
or take it to the dealer for diagnostics. they'll probably charge you for either 1/2 or 1 hour labor, probably cost $50-60-100-120.
the air sucking sound you mentioned has got me baffled.
It still sounds like the cat, but if so, generally removing the front o2 sensor will improve things a little bit. not a lot, but a little. you did remove the one before the cat right ? yeah i know you did, but just had to ask.
one last question. when its reving up to the 1300-1400-1500 mark, are you getting good strong exhaust flow ?
a few more random ideas.
do you live anywhere close to a muffler shop where you could limp in and let them check the cat ? as soon as they saw it off, you'll know if that was it or not. if not, just have them weld it back on
or the same thing as do it yourself. take a saws-all and saw the cat loose. if thats not it you'll have to reweld it, or clamp it back together.
or take it to the dealer for diagnostics. they'll probably charge you for either 1/2 or 1 hour labor, probably cost $50-60-100-120.
Record Breaker
Joined: Feb 2006
Posts: 1,567
Likes: 0
From: Richmond, Va
RE: 98 RAM Loss of Power
ORIGINAL: dhvaughan
there are a few more sensors, but just replacing them randomly w/o cause is expensive and silly. you've got MAP, Intake Air Temp, Crank Position, Cam Position.
the air sucking sound you mentioned has got me baffled.
It still sounds like the cat, but if so, generally removing the front o2 sensor will improve things a little bit. not a lot, but a little. you did remove the one before the cat right ? yeah i know you did, but just had to ask.
one last question. when its reving up to the 1300-1400-1500 mark, are you getting good strong exhaust flow ?
a few more random ideas.
do you live anywhere close to a muffler shop where you could limp in and let them check the cat ? as soon as they saw it off, you'll know if that was it or not. if not, just have them weld it back on
or the same thing as do it yourself. take a saws-all and saw the cat loose. if thats not it you'll have to reweld it, or clamp it back together.
or take it to the dealer for diagnostics. they'll probably charge you for either 1/2 or 1 hour labor, probably cost $50-60-100-120.
there are a few more sensors, but just replacing them randomly w/o cause is expensive and silly. you've got MAP, Intake Air Temp, Crank Position, Cam Position.
the air sucking sound you mentioned has got me baffled.
It still sounds like the cat, but if so, generally removing the front o2 sensor will improve things a little bit. not a lot, but a little. you did remove the one before the cat right ? yeah i know you did, but just had to ask.
one last question. when its reving up to the 1300-1400-1500 mark, are you getting good strong exhaust flow ?
a few more random ideas.
do you live anywhere close to a muffler shop where you could limp in and let them check the cat ? as soon as they saw it off, you'll know if that was it or not. if not, just have them weld it back on
or the same thing as do it yourself. take a saws-all and saw the cat loose. if thats not it you'll have to reweld it, or clamp it back together.
or take it to the dealer for diagnostics. they'll probably charge you for either 1/2 or 1 hour labor, probably cost $50-60-100-120.
Thread Starter
Joined: Aug 2007
Posts: 13
Likes: 0
RE: 98 RAM Loss of Power
Hi dhvaughan
I fooled around with the map sensor but that seems to only adjust things slightly. I have wondered about the cam sensor and the crank position but I don't know much about their purpose. The air sucking sound is sort of like a moan/suck noise coming from the throttle body( I have the filter assy removed) but it sounds like its starving for fuel (I can spray more fuel into the throttle body but no difference)
To your question about exhaust flow at x rpm's, I don't know at the moment. I will check tomorrow.
From looking at the cat, it looks original and the truck has 199k miles. I don't mind cutting it off if I can convince myself that this isthe highest potential. After removing the O2 sensor and seeing no difference, I turned my attention to other possibilities. I have had a bad cat once and it glowed bright red, this one does not. I will have to put it on a trailer to get it to a shop, it want make it out of my driveway.
Thanks for the continued help!
I fooled around with the map sensor but that seems to only adjust things slightly. I have wondered about the cam sensor and the crank position but I don't know much about their purpose. The air sucking sound is sort of like a moan/suck noise coming from the throttle body( I have the filter assy removed) but it sounds like its starving for fuel (I can spray more fuel into the throttle body but no difference)
To your question about exhaust flow at x rpm's, I don't know at the moment. I will check tomorrow.
From looking at the cat, it looks original and the truck has 199k miles. I don't mind cutting it off if I can convince myself that this isthe highest potential. After removing the O2 sensor and seeing no difference, I turned my attention to other possibilities. I have had a bad cat once and it glowed bright red, this one does not. I will have to put it on a trailer to get it to a shop, it want make it out of my driveway.
Thanks for the continued help!
Joined: Feb 2008
Posts: 1
Likes: 0
RE: 98 RAM Loss of Power
I realize this is kind of old but if you are still having the problem replace the cap and rotor and plugs and wires. Mine did the same thing all of a sudden when i was driving home and i changed these things and it ran just fine. Also if you still have the stock cat on there it is probably about to go out, either get a new one or just cut the cat open, punch the honeycomb out of it, and then weld it back up. Good Luck.
Legend
Joined: May 2005
Posts: 8,663
Likes: 8
From: Central Oklahoma
RE: 98 RAM Loss of Power
ORIGINAL: mdelfunt
Hi dhvaughan
I fooled around with the map sensor but that seems to only adjust things slightly. I have wondered about the cam sensor and the crank position but I don't know much about their purpose. The air sucking sound is sort of like a moan/suck noise coming from the throttle body( I have the filter assy removed) but it sounds like its starving for fuel (I can spray more fuel into the throttle body but no difference)
To your question about exhaust flow at x rpm's, I don't know at the moment. I will check tomorrow.
From looking at the cat, it looks original and the truck has 199k miles. I don't mind cutting it off if I can convince myself that this isthe highest potential. After removing the O2 sensor and seeing no difference, I turned my attention to other possibilities. I have had a bad cat once and it glowed bright red, this one does not. I will have to put it on a trailer to get it to a shop, it want make it out of my driveway.
Thanks for the continued help!
Hi dhvaughan
I fooled around with the map sensor but that seems to only adjust things slightly. I have wondered about the cam sensor and the crank position but I don't know much about their purpose. The air sucking sound is sort of like a moan/suck noise coming from the throttle body( I have the filter assy removed) but it sounds like its starving for fuel (I can spray more fuel into the throttle body but no difference)
To your question about exhaust flow at x rpm's, I don't know at the moment. I will check tomorrow.
From looking at the cat, it looks original and the truck has 199k miles. I don't mind cutting it off if I can convince myself that this isthe highest potential. After removing the O2 sensor and seeing no difference, I turned my attention to other possibilities. I have had a bad cat once and it glowed bright red, this one does not. I will have to put it on a trailer to get it to a shop, it want make it out of my driveway.
Thanks for the continued help!