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Old 07-29-2010, 08:51 PM   #1
bigjim240z
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Default 2000 Ranger problems. Need help!

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!!
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Old 07-30-2010, 05:13 PM   #2
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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!!
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Old 07-30-2010, 06:54 PM   #3
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What about the fuel pressure regulator?




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Old 07-31-2010, 06:11 AM   #4
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what is the fuel pressure
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2004 Ford Ranger Edge, ext cab, 2wd, 3.0, 5 speed, 112,000, AC. (For Sale)

Current project: 2004 Ext Cab, 4WD, 4.0, Auto, 135k(purchase price $1,350)needs an engine. I think a timing chain skipped. No rust or dents, needs a compound.

1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD)
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Old 07-31-2010, 06:21 PM   #5
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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.
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Old 07-31-2010, 06:29 PM   #6
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Quote:
Originally Posted by bigjim240z View Post
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....
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2004 Ford Ranger Edge, ext cab, 2wd, 3.0, 5 speed, 112,000, AC. (For Sale)

Current project: 2004 Ext Cab, 4WD, 4.0, Auto, 135k(purchase price $1,350)needs an engine. I think a timing chain skipped. No rust or dents, needs a compound.

1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD)
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Old 08-02-2010, 06:32 PM   #7
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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!
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Old 08-04-2010, 12:23 AM   #8
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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
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Old 08-10-2010, 12:08 PM   #9
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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.
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Old 08-12-2010, 09:46 PM   #10
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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.
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