Rough idle

BRANDONWIDENER

MEMBER
1998 FORD RANGER
2.5L
2WD
MANUAL
220,000 MILES

Just bought this truck and at low rpm's it idles rough, also while driving at low rpm the truck jerks a bit. If you keep the rpm's up it runs out fine, no jerks or roughness only at idle or low rpm's. Replaced MAF sensor, IAC sensor, spark plugs and wires. Any ideas? Also checked for vacuum leaks none that I found. Thanks

3 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Check codes for a TPS error, check fuel pressure as well. Can you get a live date read done to check 02 sensor operation?

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Thursday, September 14th, 2017 AT 5:08 AM

BRANDONWIDENER

MEMBER
2 POSTS

I have a obd2 tester and it threw a P1125 code TPS A Intermittent. Also have replaced one of the two O2 sensors, but does not throw a code for the one I have not replaced.

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Thursday, September 14th, 2017 AT 8:25 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It looks like the TPS needs replacement. After the repair clear the codes to see if they come back.

https://www.2carpros.com/articles/check-engine-light-clear-codes

You can just install the sensor it self calibrates so there is no need for programming.

Here is a Motorcraft part for 37.00 on Amazon:

https://www.amazon.com/gp/product/B000C5FJ36/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=2carprcom-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B000C5FJ36&linkId=8aac88edf5284d58e847a07dabcb9f14

Below are some diagrams:

Please let us know what happens and upload pictures or videos of the problem.

Cheers, Ken

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