Help please
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Help please
I have a 2001 4.6 aoto 4x4. Twice now when leaving work in the same spot my truck wont excelerate the tranny does not shift and no revs. I pump the gas a few times and boom away she goes. Now the truck sith for 10 hours at work and its warm out. I go about 3 bolcks and round a corner to the right when the problem occurs. I get no codes and the engine is idels fine when the problem shows its ugly face. Help me PLEASE.
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Joined: Dec 2001
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From: Louisville,Ky.
The TPS tells the computer how much throttle is being used. This is one of the inputs that it uses to adjust timing, fuel curve and tranny shifting.
Also, have you checked the fuel pressure? It could be dropping out and causing it to not want to run.
Jimmy
Also, have you checked the fuel pressure? It could be dropping out and causing it to not want to run.
Jimmy
Senior User
Joined: Feb 2001
Posts: 223
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From: Long Island
I have a 2001 4.6 aoto 4x4. Twice now when leaving work in the same spot my truck wont acccelerate the tranny does not shift and no revs. I pump the gas a few times and boom away she goes. Now the truck sith for 10 hours at work and its warm out. I go about 3 bolcks and round a corner to the right when the problem occurs.
belly boat,
lxman1 is probably right. If what you mean by "in the same spot" is that the problem occurs at the same point in your drive home, it indicates a bad sensor.
When you start your engine "cold", it will run "open loop". Meaning it runs on a pre-programmed routine for A/F, timing, tranny shifts etc. When it comes up to temp the ECU "takes over" and reads the various sensors and uses this info to set the A/F etc.
If at the point you go from "open loop" to "closed loop" you have a drivability problem you can be sure it is a sensor or ECM problem.
Going by your symptoms I'd agree with lxman 1 and start with the TPS.
Good Luck,
Bill
belly boat,
lxman1 is probably right. If what you mean by "in the same spot" is that the problem occurs at the same point in your drive home, it indicates a bad sensor.
When you start your engine "cold", it will run "open loop". Meaning it runs on a pre-programmed routine for A/F, timing, tranny shifts etc. When it comes up to temp the ECU "takes over" and reads the various sensors and uses this info to set the A/F etc.
If at the point you go from "open loop" to "closed loop" you have a drivability problem you can be sure it is a sensor or ECM problem.
Going by your symptoms I'd agree with lxman 1 and start with the TPS.
Good Luck,
Bill
Last edited by wmcnally; Oct 5, 2003 at 10:07 PM.
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Freshman User
Joined: Jun 2003
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Just checked tps it has no bad spots. Has 5v signal and when I open it up slowly it gradualy goes up to 4.84 then down with no odd dips.
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Post Fiend
Joined: Jan 2002
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From: USA
Do you have a scanner with capture mode ?
Drive the vehicle and do a capture of all systems
then look at the data
You need to see if the tps is sending the correct info the the pcm.
Done this many times to find intermittent type problems
Did you chk the fuel pressure as suggested?
or change the fuel filter ?
Rich
Drive the vehicle and do a capture of all systems
then look at the data
You need to see if the tps is sending the correct info the the pcm.
Done this many times to find intermittent type problems
Did you chk the fuel pressure as suggested?
or change the fuel filter ?
Rich
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