Couple months ago I swap engine on my 95 ranger and installed a similar engine but from a 97 and is been running great, still a bit shakie but nothing serious. Now is really rough, kind of sputtering, but when the truck warms up it goes away. I have also notice a gas fumes smell inside the cab. I have checked the pcv valve and is good even though I'm tempted to change it anyways, I have checked for vacuum leaks and no leaks found and dont know what else could be causing this problem. Would the purge valve, purge valve soleinoid, and/or charcoal vapor canister could cause this problem? something else that cross my mind was a fuel problem or electrical perhaps? Help please!!!! Thank you!

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1995 XLT 2.3 SOHC Ford Ranger with a 1997 2.3 SOHC Ford Ranger engine ( that is the only modification, if you can call it that, ) there is no other modifications or alterations to this truck for now.

Disconnect the battery for about 20 minutes. Next time you start, it will be forced to relearn a number of settings. The engine is not using sensors when cold.

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(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

I will try that today as well double check the vacuum lines for a leak, 'cause a lot of ppl keep telling me about vacuum line leak somewhere. thanks for the input, I will keep you posted!

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1995 XLT 2.3 SOHC Ford Ranger with a 1997 2.3 SOHC Ford Ranger engine ( that is the only modification, if you can call it that, ) there is no other modifications or alterations to this truck for now.

Well I disconnected the battery for at least 20 minutes and double checked for any vacuum leaks again and nothing still doing the same thing. Unless I'm missing a vacuum line, I think I checked all of them. The only other I can do is to replace all of the vacuum line and see if that takes care of the problem. I dont know what do you think?

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1995 XLT 2.3 SOHC Ford Ranger with a 1997 2.3 SOHC Ford Ranger engine ( that is the only modification, if you can call it that, ) there is no other modifications or alterations to this truck for now.

Well it has been a couple of weeks and not able to figure out the problem and now that
temperatures had drop the problem is worst. I'm going to do what I didn't want to do and is take it to a mechanic. Is probably something simple but I need my truck running. Thanks guys for all the help!!!!

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1995 XLT 2.3 SOHC Ford Ranger with a 1997 2.3 SOHC Ford Ranger engine ( that is the only modification, if you can call it that, ) there is no other modifications or alterations to this truck for now.

Did you try a lighter oil for the cold weather? Check the plugs?

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96 Xlt 2wd
4in rough country lift
31's

A lighter oil is not the solution. Its designed to work properly with what it has. 50 degrees is not cold. He's in North Carolina, not Prudo Bay.

If you smell fuel, its running rich. Vacuum leaks cause a lean condition so I doubt it is a vacuum leak. If it's running rich, you're either
1) Not getting enough air, but it thinks it is. MAF or IAC failure.
2) Not getting good spark to burn the fuel. Plugs & wires.
3) Getting too much fuel. Leaky injector.

Most of these things would happen all the time, not just during open loop cold idle. However, once it is warmed up and in closed loop, it could be compensating enough using sensors to work properly.

__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

I went to Advance today to get it scanned and found the O2 sensor faulty as well as the EGR with not enough flow. Another thing that the guy at Advance said to me and I did not think about, was to trace my steps back of the problem started and I remember that it was the day after I filled up the tank at the gas station at my job, that is when the whole problem started. Maybe the fuel system got some trash in it or maybe water in the fuel (bad fuel). I disconnected the O2 sensor on the upstream and added some Lucas fuel treatment a few days ago and seems to be like is doing better, is not as bad as it was 3 days ago. I will use up most of the gas in this tank and then fill it up with premium to try to clean the system and see if that will help and it better, because I tell you I have never replaced so many sensors in car in my whole life.
Things that I have done:
Checked for vacuum leaks ( like 6 times), replaced PCV valve, replaced intake manifold upper gasket as well as the throttle body and AIT gasket, replace the coolant temp. sensor, disconnected the O2 sensor ( which I will replace in the next few days).
And the smell of fumes I found out yesterday what it is, is the fill up tube to the gas tank, the rubber is all cracked and it leaks everytime I fill the tank.
Thans for the help and if you have anymore suggestions please let me know.

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1995 XLT 2.3 SOHC Ford Ranger with a 1997 2.3 SOHC Ford Ranger engine ( that is the only modification, if you can call it that, ) there is no other modifications or alterations to this truck for now.