Maybe cat?
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Junior Member
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Slow acceleration NO CEL catalytic converter?
1997 f150 xlt 4x4 4.6
symptoms:
loss of torque and power
slow acceleration
slower on hot day
slow to gain speed (get up to freeway speeds)
slow to climb hills
did I mention it’s slow
very low gas mileage maybe 10mpg (guessing don’t criticize)
NO CHECK ENGINE LIGHT
Things I’ve done:
MAF (have 2 tried both before cleaning and trying both)
cleaned throttle body (have 2 with all sensors tried both)
removed air filter and drove/ got new air filter no change in either
fuel system cleaner
never had a misfire so holding off on plugs wires and coils
had the truck for a little over a year, bought it with a blown head gasket put a used engine in it from my totaled truck, same year but 4x2. The symptoms only change with the weather and don’t Change much just slower when it’s hot than when it’s cold but still slow when it’s cold and I know it sounds fine cause it’s supposed to be slower in hot weather but it is not fine I’m talking real slow. It will make it up to 100 mph but will struggle to get there I almost feel like I’m gonna brake something at 90. No shaking or misfires just can feel it struggle. Out of the time I’ve had this truck only one code popped up for an hour until I cleared it and it was one of the 02 sensors but has never came back. This is my 3rd f150 and the slowest ford I’ve ever driven without a cel. It’s pretty mind boggling, I don’t have access to mode$06 scanners or live data all I have to diagnose is an infrared thermometer but I’m not 100% sure what I’m looking for when using it. My last truck ran 100% fine and the only things on this truck that aren’t from my last truck are the trans and exhaust and the trans seems fine fluid good i don’t wanna change it cause I’ve had bad luck changing fluid while experiencing problems.
ANY HELP WILL BE GREATLY APPRECIATED PLEASE DO NOT CRITICIZE AS I WILL TRY TO HELP YOU HELP ME
symptoms:
loss of torque and power
slow acceleration
slower on hot day
slow to gain speed (get up to freeway speeds)
slow to climb hills
did I mention it’s slow
very low gas mileage maybe 10mpg (guessing don’t criticize)
NO CHECK ENGINE LIGHT
Things I’ve done:
MAF (have 2 tried both before cleaning and trying both)
cleaned throttle body (have 2 with all sensors tried both)
removed air filter and drove/ got new air filter no change in either
fuel system cleaner
never had a misfire so holding off on plugs wires and coils
had the truck for a little over a year, bought it with a blown head gasket put a used engine in it from my totaled truck, same year but 4x2. The symptoms only change with the weather and don’t Change much just slower when it’s hot than when it’s cold but still slow when it’s cold and I know it sounds fine cause it’s supposed to be slower in hot weather but it is not fine I’m talking real slow. It will make it up to 100 mph but will struggle to get there I almost feel like I’m gonna brake something at 90. No shaking or misfires just can feel it struggle. Out of the time I’ve had this truck only one code popped up for an hour until I cleared it and it was one of the 02 sensors but has never came back. This is my 3rd f150 and the slowest ford I’ve ever driven without a cel. It’s pretty mind boggling, I don’t have access to mode$06 scanners or live data all I have to diagnose is an infrared thermometer but I’m not 100% sure what I’m looking for when using it. My last truck ran 100% fine and the only things on this truck that aren’t from my last truck are the trans and exhaust and the trans seems fine fluid good i don’t wanna change it cause I’ve had bad luck changing fluid while experiencing problems.
ANY HELP WILL BE GREATLY APPRECIATED PLEASE DO NOT CRITICIZE AS I WILL TRY TO HELP YOU HELP ME
Last edited by 97f150x4; Jun 6, 2018 at 07:05 PM. Reason: Change title
Thread Starter
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Thanks, Bruce
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
Bruce, your subjecting your self to being to tight on diagnostic trouble shooting to the point of guessing.
No CEL does not mean there is no issues.
You need to use a Scanner to look at live data for being out of normal range. Then correct for any found until all are normalized.
Reason; the program is written with values placed to allow wide deviations for conditions, aging and wear.
If not, the CEL would come on for every small limit infraction that occurs. You would not be happy with that either.
This is why Scanners are used and understanding of the system are available.
Good luck.
No CEL does not mean there is no issues.
You need to use a Scanner to look at live data for being out of normal range. Then correct for any found until all are normalized.
Reason; the program is written with values placed to allow wide deviations for conditions, aging and wear.
If not, the CEL would come on for every small limit infraction that occurs. You would not be happy with that either.
This is why Scanners are used and understanding of the system are available.
Good luck.
Senior Member
Joined: Jan 2002
Posts: 5,994
Likes: 221
From: Wilmington,NC
The auto shops around here have fuel pressure gauges for loan to check the fuel pressure. Do that. Then take it to an exhaust shop to get the cats checked. The one time i had that done was about 20 yrs ago and Midas charged $35 if I remember correctly. The drilled a hole in the exhaust in front of the converter, held a pressure gauge that had a rubber tip against the hole and measured the pressure. Mine was okay so they welded up the hole. You've probably wasted enough gas to pay for some repair by now.