2000 Ranger problems. Need help!

[bigjim240z]

Getting the dreaded po302 code in my 2000 ranger 2.5, 5 speed. Changed the plugs, wires, both coil packs, injector, fuel filter, egr valve, egr pressure sensor, mass air meter and last but not least the whole cylinder head. Took it to ford dealer and they said it had a burned valve (thats why i swapped the head with a fresh rebuilt unit). Nothing has fixed this problem. I can start it and it will run rock soild till i touch the gas. It will rev up just fine but when it comes back down to idle it will miss and run rough like it wants to stall for 5-10 sec then smooth out again at idle. It will idle smooth all day till i touch the gas. I disconnected the cat just to see if maybe it was plugged up but it runs exactly the same. Im at my wits end! Ive spent alot of money trying to fix this and nothing has helped. Ive looked for vaccume leaks but havent found anything yet. My next step is the ecu....should i???? Need help. I need this truck running and plan to build it into a prerunner. Thanks for any help!!

 

[bigjim240z]

20 veiws, no replys. You guys must be stumped too. Guess ill try to find an ecu to try. Hope i can just borrow one!!

 

[Beleneagle]

What about the fuel pressure regulator?




David

 

[modelageek]

what is the fuel pressure

 

[bigjim240z]

Honestly thats the one thing i did over look. Thats a cheap part to throw on this evening. I never checked the fuel pressure, think that could cause only number 2 cylinder to misfire? Ill try anything. Off to the parts store.

 

[modelageek]

Honestly thats the one thing i did over look. Thats a cheap part to throw on this evening. I never checked the fuel pressure, think that could cause only number 2 cylinder to misfire? Ill try anything. Off to the parts store.

on your truck the fuel pressure regulator is part of the fuel pump in the tank. you want to get a fuel pressure tester. the stores loan them out for free. or you can buy one. harbor frieght has one for $20........... you want koeo about 65, koer about 65 and you want the pressure to drop no more than 8 psi in 5 minutes after you turn the engine off....

 

[Beleneagle]

I think I would run off to Harbor Freight and pick up one of their Spark tools that plug in-between the plug and wire and see for yourself if it firing like it should. They are dirt cheap too!

 

[Friiy]

Have you checked the wiring going to your # 2 fuel injector?..... Maybe you have a intermittent short or open on that injector wire harness or plug...(a break in the wire that that you can't see under the insulation) I think there is a in-line/ plug-in test light Harbor Freight makes that flashes as the injector fires..

-Friiy

 

[bigjim240z]

Yup, checked that too, and changed the fuel pump this past weekend just for the hell of it. Didnt change anything. I wanna burn this pos.

 

[bigjim240z]

Well yesterday i decided to change the crank position sensor, didnt help. I took it to a guy i know who has worked for chevy for 30 years. A car is a car so i figured i would give him a crack at it. He found nothing and thinks it could be a high oil pressure issue??? He said high oil pressure could cause a valve lifter to pump up and stay open a little causing a miss. The oil pump is $215.00!!!!! Guess ill throw a gauge on it and see what kinda pressure its putting out before buying a new pump. Next step is the cam position sensor, what the hell its only 15 bucks.

 

[modelageek]

You are putting a"how not to climic" on. Did you change the fuel pump without doing a pressure test first?

Have you changedthe oil to full synthetic? Are you still getting the p0302? Code? Have you changed/checked the IACV? You are the 1st person that has ever mentioned high OP. Sounds odd!

 

[nathan0053]

had the same problem with my 2000 2.5 for years and found out what the problem was. Next to your thermostat there is another sensor all i did was unplug it and the problem was solved still have a code but the engine never reves up anymore now i can just hop in and drive it like the day i bought it. hope this help good luck.

 

[modelageek]

had the same problem with my 2000 2.5 for years and found out what the problem was. Next to your thermostat there is another sensor all i did was unplug it and the problem was solved still have a code but the engine never reves up anymore now i can just hop in and drive it like the day i bought it. hope this help good luck.

that senosr that you unplugged is the ECT senosr .it ffeeds the pcm engine temp info. they are $15. I would repalce it..the truck will not run at it's most efficient without it.

 

[nathan0053]

thanks for the info

 

[00angerfonz]

i read in another article that the guys similar issue went away when he dumped seafoam into the oil somthing about a check valve causes confusion in the truck thus throwing a trouble light. my truck has the exact same issues that you explained and im gunna give it a try
best of luck my friend