Hesitation and rough idle

Tiny
ETHANER
  • MEMBER
  • 1993 FORD F-150
  • 4.9L
  • 6 CYL
  • RWD
  • MANUAL
  • 176,000 MILES
My truck has a straight six cylinder engine and it recently developed this problem to where its runs too rough or rich and I can only get about half throttle before it starts to bog down and almost stall, also when I am coming to a stop I will take it out of gear and coast to the light or stop sign and when that happens the engine almost stalls and I can hear it just revving erratically.

I changed the distributor cap and spark plugs, air and fuel filter and the throttle position senor.

I am about to look at the oxygen sensor but I want to find out if someone else has any advice before I start pouring money into it.
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Friday, October 28th, 2016 AT 11:47 AM

4 Replies

Tiny
HMAC300
  • EXPERT
Scan for trouble codes and check fuel pressure with a gauge first auto parts rent it. See link. Also use jumper for getting codes which is left hand front near firewall.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Friday, October 28th, 2016 AT 12:27 PM
Tiny
RENEE
  • ADMIN
Hello Ethaner,

Sorry to hear about your car troubles! HMAC's idea about checking fuel pressure is a great recommendation. To help you out I have a video link that can aid you in solving your problem! https://www.youtube.com/watch?v=peh7-pFycyc

Have a great day and please let us know what happens!
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Saturday, October 29th, 2016 AT 3:33 PM
Tiny
ETHANER
  • MEMBER
Well I tried to do the KOER test and got some faults but they might have been a mistake. One thing that stood out was a solenoid failure and EGR failure. I replaced the whole unit not too long ago. I'm having trouble finding workshops that will check OBD 1, there is one place that does but they want $125 and i'm not looking to spend that much on a check but I might have to if I cant get anywhere.

I have not checked the fuel pressure yet, I will try that.
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Tuesday, November 1st, 2016 AT 9:25 AM
Tiny
KEN
  • ADMIN
You can do the obd1 yourself

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Please let us know what you find so it will help others.

Best, Ken

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Tuesday, November 1st, 2016 AT 10:13 AM

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