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Old October 18th, 2009, 03:02 PM   #1
lepp1892
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Default 1992 Ranger 4.0 Bogging Down

I have a 1992 Ranger that was 4.0 from factory and now has a 4.0 from a 94 explorer with the explorer computer.

The truck is Bogging down under acceleration and stalls almost everytime I come to a stop.

It is throwing 3 codes.
Code 565- Canister Purge 1 (Solenoid Circuit Failure)
Code 557- Low speed pump relay (Primary Circuit Fault)
Code 542- Fuel Pump Open (Bad ground or always on)

I was wondering what does this all mean? It really doesn't seem like the engine is getting enough fuel.

Thanks in advance for the help
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Old October 19th, 2009, 10:14 AM   #2
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Any ideas?
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Old October 20th, 2009, 10:24 AM   #3
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did you use the 94 injectors/fuel rail/regulator?

seems the older ones used a frame rail mounted pump and later ones used a in-tank unit.

check the pressure at idle.
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Old October 20th, 2009, 10:28 AM   #4
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I think they did away with the two pump fuel system in the late 80's.


Has it been doing it since the swap or just started doing it. And did it run fine at first after the swap?

Did you use the harness from the explorer or just plug in the explorer ecm into the rangers harness? The pinouts are different between the two. I would of been surprised it ran at all.

Last edited by CheapThrillB2; October 20th, 2009 at 10:34 AM.
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Old October 20th, 2009, 10:37 AM   #5
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Quote:
Originally Posted by lepp1892 View Post
I have a 1992 Ranger that was 4.0 from factory and now has a 4.0 from a 94 explorer with the explorer computer.

The truck is Bogging down under acceleration and stalls almost everytime I come to a stop.

It is throwing 3 codes.
Code 565- Canister Purge 1 (Solenoid Circuit Failure)
Code 557- Low speed pump relay (Primary Circuit Fault)
Code 542- Fuel Pump Open (Bad ground or always on)

I was wondering what does this all mean? It really doesn't seem like the engine is getting enough fuel.

Thanks in advance for the help
I am going to assume you just plugged the explorer ecm into the ranger harness.

The 92/94 fuel injection is wired/controlled different. Plug your old ecm back in and use the engine harness from the 92 4.0L.

92 ranger and 94 explorer have different pin outs. I am surpised it even runs at all.

I pulled out the pin out diagrams for both ecm's and there are about 20 different pin outs between the two ecms.

The canister purge is pin # 11 on the explorer ecm and pin #31 on the ranger for example.

Pin #31 on explorer ecm isn't used for anything and neither is pin #11 on the ranger. This would cause the code 565 for example

Last edited by CheapThrillB2; October 20th, 2009 at 12:41 PM.
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Old October 22nd, 2009, 12:29 AM   #6
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It has ran fine up until now (for about 6 or 7 months). I am using everything the mounts on the engine from the explorer and all the wiring is from the ranger.

It has been throwing EGR codes. The codes I posted are just the ones that I didn't think I had seen before. It might have thrown code 565 before it just didn't come into my mind that it had thrown it before.

If you want I can get the whole list of codes it's throwing. Including all the EGR ones.
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Old October 28th, 2009, 11:58 PM   #7
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Did you switch the pins in the harness to match the Explorer computer? If not, I would just try and put the Ranger computer back in and see of your troubles clear up. Be lucky it does run, if thats the case. There wouldn't really be any advantage of running either computer over the other. Just having one to match the harness would be the key.
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Old December 22nd, 2009, 11:21 AM   #8
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if you use all ranger parts including the plenun it will work otherwise clean your throttle plate
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Old December 22nd, 2009, 11:22 AM   #9
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also check o2 senser an idle air control motor on driver side of plenum
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Old December 22nd, 2009, 07:41 PM   #10
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Have you ever messed with the cam position sensor? I found my truck was doing the same thing...bog off idle, no power under accel,stalling,etc, and it turned out my dumby shaft for the cam sensor was loose and had moved out of sync and was firing the injectors way out of time. Reset sensor with alignment tool and all is good.
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Old December 23rd, 2009, 12:14 AM   #11
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It actually started running perfectly fine after about a week or so of it running like crap...
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Old December 23rd, 2009, 06:42 AM   #12
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not all 4.0L have the cam sensor you described. I have found usually the ones from emission states do. Same as EGR valves. None of the explorers/ranger 4.0Ls I have owned have the cam sensor or egr valves. But A buddy of mine has both on his explorer. His was from New York.
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Old December 23rd, 2009, 09:48 AM   #13
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Mine has the cam position sensor but it is not plugged in.
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