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Check engine light on?

Tiny
19F15096
  • MEMBER
  • 1996 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 139,500 MILES
I have a 1996 ford f-150. 5.0 v8. 4x4. Automatic. Everything is completely stock. My check engine light came on about 2 weeks ago for the first time. I didnt think much of it cause it ran just the same, till I figured out that im only getting roughly 8 miles to a gallon of fuel. Then over time my truck statred idleing lower and lower and now is down just under 500rpm. I went and had the code read and it came back as either too high or too low fuel pressure, a leaky fuel injector, vacuum leak, or a leaking or defective fuel pressure regulator or fuel vacuum diaphram thingy. The truck would drive fine, it never once stalled and actually seemed to have more power im guessing due to the amount of fuel useage. Now just today, while driving about 55mph the first time and only 25mph the second, both were right around 1500rpm's, the engine would shake very violently as if to have ran out of fuel and was only firing on a few of the cylinders. Any info, suggestions, or things to try would be greatly appreciated. Also any suggestions on how to test any of the item stated above like the leaky fuel injector would be a big help. Thanks, justin.
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Sunday, August 1st, 2010 AT 8:56 PM

35 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Read this guide to get the codes

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

This video will help you clear the codes

https://youtu.be/ahK_eucFi-k

Please let us know what happens. Please run down this guide and report back.
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Sunday, August 1st, 2010 AT 9:36 PM
Tiny
19F15096
  • MEMBER
  • 2 POSTS
I actually did go to autozone and they put it on the computer for free. The code that came up was P1151

definition,
lack of o2 switches-bank 2 sensor 1

explanation,
ecm could not adjust fuel trim because of a lean or rich condition

probable cause,
-fuel pressure high or low
-MAF sensor dirty/defective
-vacuum leak on engine
-leaking fuel injector or fuel pressure regulator

where do I go from here?
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Monday, August 2nd, 2010 AT 3:09 PM
Tiny
SHROPPY40
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
  • 150,000 MILES
I have a 1996 f150 pick up I have had it checked but the codes said I needed sensors so I had them all replaced. Can u tell me why
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
First of all, the code never tells you anything but a number. That numb er never identifies a bad part, just a failed system.

What was the code number?

Roy
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
DONNA1966
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 174,000 MILES
My truck keeps blowing the fuse for the cigerette lighter and generic scan tool I need to know where the scan tool is located and what it is
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi:
Make sure the wiring to the lighter is good and not damaged. Also, make sure a coin didn't fall into the lighter socket. Finally, I'm not sure what scan tool you are refering to. Can you explain?

Joe
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
KEN GRUBBS
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
Computer problem
1996 Ford F150 6 cyl Two Wheel Drive Manual

This vehicle only has 52,000 miles and has not been driven very much the past 5 years. The recent work has been tune-up items, (spark plugs, air and fuel filters, cap and rotor, and clean throttle body). The engine light comes on and when I scan the codes PO 135, PO141, and PO155 all show up at the same time. If I clear them and start to drive, it takes approximately 3 miles to store the faults again. The vehicle runs so quiet and smooth that you barely know it's running. I took a gamble and replaced the 2 front O2 sensors, and it still faults the same 3 codes. Keep in mind that this is the smoothest running vehicle, if it wasn't for the check engine light being on, I wouldn't even be worried. Thanks, Ken
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Its the o2 heater circuit
u need to check the fuses as a 1st step
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
BRINTON
  • MEMBER
  • 2 POSTS
I have this same problem in my 1996 F-150 5.0 V8. I have checked the fuses as BMRFIXIT recommends, and they are fine. I was hoping that Mr. Grubbs could detail how he resolved the problem, or have others suggest solutions.

Thanks

Brinton
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Do u have the same three codes?
Was the sensors replaced?
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
BRINTON
  • MEMBER
  • 2 POSTS
Dear BMRFIXIT,

Thank you for responding. I do have the same three codes. I have replaced all three o2 sensors and still have the same codes. I have.25 volts at the heater circuit of the pigtail connection to the o2 sensor. I am not sure if that reading is enough volts for the heater circuit. The fuse for the heater circuit is fine.

It is possible that I have a ground problem or an open circuit somewhere. When I turn on the factory radio, I do get a second or so of feedback just as it turns on. Perhaps this is causing or is a clue to the codes showing as a heater circuit problem?

The previous owner had an aftermarket alarm installed and an aftermarket hitch with lights for the trailer brakes. Perhaps these are also clues.

Please help!
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Disconnect O2 sensor and turn key ON or start check for battery power at the plug
you should have battery power at one of the wires and a ground on the other if not suspect bad wire check the ORG wire
check if the fuse has battery power
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Thursday, September 10th, 2020 AT 10:01 AM (Merged)
Tiny
SCHUCK
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
  • 6 CYL
  • 4WD
  • MANUAL
  • 144,800 MILES
Check engine light came on, had a diagnostic test with a code P1131
Definition: Lack of bank 1 02 transistions - Lean
Explanation: ECM detected bank 1 02 at its lean limit
Probable Causes:
1) Misfire on bank 1
2) Vacuum leak affecting bank 1 only
3) Fuel injector problem bank 1
4) Engine Mechanical condition

Light came on: on a long road trip had the test done used fuel injector cleaner then after three cold starts went off; then came back on after a 400 mile trip all has happened within the last 3 weeks. How seriuos is the problem and is it a simple fix that a novice could do?
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Thursday, September 10th, 2020 AT 10:02 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check intake manifold gasket
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Thursday, September 10th, 2020 AT 10:02 AM (Merged)
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
  • 348 POSTS
Swap injectors from another cylinder and see if the code occurs. If the injector is bad the cylinder you swaped with should show up on the code. If nothing changes then check your spark plug for proper gap and plug wire for proper connection.
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Thursday, September 10th, 2020 AT 10:02 AM (Merged)
Tiny
ACROWLEY
  • MEMBER
  • 1 POST
  • 1995 FORD F-150
  • 182,700 MILES
When I start my truck warm or cold, it idles for a couple seconds but then starts idling high up to 2000 to 2500 rpm. The check engine light blinks a few times and the rpms drop to almost a stall and then recovers to a normal idle. Sometimes when it drops to almost a stall, it does stall. What is causing this? After all of that the truck runs fine
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Thursday, September 10th, 2020 AT 10:03 AM (Merged)
Tiny
SEANGRANT00
  • MECHANIC
  • 334 POSTS
Check engine light blinking typically means you have a misfire (s).

This guide can help get the codes.

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

First thing I would do is get the computer (OB2) scanned. This will make it easier to help in the diagnosis. Most auto part stores will do this for free. When you get the codes, write them down and let me know what they are. There are many problems that could create this symptom and without speculating for hours let's try this out first and I'll be happy to help you out in finding the problem.

Thanks look forward to your reply

Sean
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Thursday, September 10th, 2020 AT 10:03 AM (Merged)
Tiny
DEUCE4952
  • MEMBER
  • 1 POST
  • 1995 FORD F-150
The check engine light will NOT come on, therefor I cannot get it smogged, what to do?
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Thursday, September 10th, 2020 AT 10:03 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Notice the diagram, check the fuse. Check voltage and ground. The circuit is grounded by the pcm. Voltage comes from the fuse. Could be problem with wiring circuit? The bulb could be burned out or vibrated loose.
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Thursday, September 10th, 2020 AT 10:03 AM (Merged)
Tiny
ZOOMONDA
  • MEMBER
  • 1 POST
  • 1995 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 178,000 MILES
When I start my 95 f-150 the engine light flashes 4 times. Then the engine idles up and then when I go to put it in drive it dies.
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Thursday, September 10th, 2020 AT 10:04 AM (Merged)

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