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Engine started running rough

Tiny
CARTER SPARKS
  • MEMBER
  • 2002 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 2,000 MILES
It starts but when you touch the gas pedal it shuts off. Touch the gas pedal if it does run it runs badly. When you started up and then runs perfect it will not happen. Came home went to church came home shut it off. We have started back up and it has been at Fowler's tracks because it is running some badly I do not know what happened to it.

Also, I put a new timing chain in. I have put oxygen sensors, camshaft sensors has a start pop through the exhaust. I cut the catalytic converters off it still does not have enough power to pull itself out of the tracks like I said hit run perfect until I shut it off.
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Thursday, April 5th, 2018 AT 3:04 AM

53 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
Hello,

It sounds like you have a TPS sensor that is out but to be sure lets run the codes to see what comes up.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know what you find.

Cheers, Ken
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Friday, April 6th, 2018 AT 11:57 AM
Tiny
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What is a TPS sender and where is it located at? I had it checked and all I got was a oxygen sensor was bad which I replaced were is the tps.
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Sunday, April 8th, 2018 AT 5:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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The TPS can cause all kinds of problems here are diagrams to help you get the sensor replaced.

Check out the diagrams (below).

Please let us know what happens.

Cheers, Ken
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Monday, April 9th, 2018 AT 9:26 AM
Tiny
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TPS was a help, but when you put the it in gear it does not want to take the gas or it cuts out. Can you help me?
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Monday, April 23rd, 2018 AT 3:31 PM
Tiny
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Tps was a help but when you put the it in gear it doesn't want to take the gas or it cuts out can you help me
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Monday, April 23rd, 2018 AT 3:31 PM
Tiny
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  • 33 POSTS
I have a Ford f150 year 202 v6 4.2 the TPS was a help, it run good but when you put it in gear it runs rough. I do not want to pull it not the transmission it is missing or loading up or something. Can you help please?
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Tuesday, April 24th, 2018 AT 5:28 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
It sounds like you have a vacuum leak or the IAC motor is not working right can you please take a video of what the engine is doing and upload it with your reply?

This guide can help as well.

https://www.2carpros.com/articles/stall-at-idle

Please run some tests and get back to us.

Cheers, Ken
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Tuesday, April 24th, 2018 AT 10:10 AM
Tiny
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Where is the fuel injection pressure regulator on my truck and where is the fuel pressure sensor? Help please. Thank you
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Tuesday, April 24th, 2018 AT 2:05 PM
Tiny
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It runs good until I put it in gear.
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Tuesday, April 24th, 2018 AT 2:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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When you put it in gear does it stall immediately? Like bang stalled or does it take a few seconds. Here is the fuel pressure regulator location which looks like its on the fuel rail and the fuel pressure sensor location as well.

Can you take a video?

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Wednesday, April 25th, 2018 AT 9:41 AM
Tiny
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It stalls, it will move but very little, I have to push on the gas a lot just to get it to move.
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Wednesday, April 25th, 2018 AT 2:20 PM
Tiny
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Is it the one with a little air line on top of the motor?
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Wednesday, April 25th, 2018 AT 2:27 PM
Tiny
KEN L
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It almost sounds like the catalytic converter has broken apart and is closing the exhaust. Here it a guide to can try to confirm the failure:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please run down this guide and report back.

Cheers, Ken
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Thursday, April 26th, 2018 AT 9:26 AM
Tiny
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Ken the truck runs good, but when you put it in gear it bogs down and but you put it in gear it runs good. I have had the catalytic converter cut off. So it is not that. Please help.
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Thursday, April 26th, 2018 AT 1:50 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Can you take a video of what the engine is doing so I can see? Have you looked at the IAC motor. I would try that next.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

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Thursday, April 26th, 2018 AT 4:16 PM
Tiny
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Ken, I do not know how to take a video. Is the IAC motor? Is it a dealer part?
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Sunday, April 29th, 2018 AT 4:47 PM
Tiny
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I cannot find it. Can you help? Thank you.
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Sunday, April 29th, 2018 AT 4:49 PM
Tiny
KEN L
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Yes, it is under the engine cover. Here is its location.
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Monday, April 30th, 2018 AT 11:15 AM
Tiny
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Ken, the idle air control motor that is in the throttle body is it a dealer part or can I get it elsewhere? I cannot seem to find it.
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Tuesday, May 1st, 2018 AT 2:38 PM
Tiny
KEN L
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Got it on Amazon $45.00.

https://www.amazon.com/gp/product/B00T1BWCNM/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B00T1BWCNM&linkId=ac8adb11c804f37dabf4e1406e4fef73

Let me know
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Tuesday, May 1st, 2018 AT 6:30 PM

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