1998 ranger p0340 code 1998 engine ???
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1998 ranger p0340 code 1998 engine ???
I have a couple of questions. 2 years ago I hade a rebuilt motor installedin my 1998 ranger.(ha ha Joke was on me), turns out the motor come from a junk yard or so the dealer says. anyway ten minutes or less after new motor was installed light comes on. two years later i have to go for emmisions test and fail. computer says misfire detection disabled. buy a new cams position sensor only to find I have purchased a 3 wire sensor and there is a 2 wire sensor on the engine. Get the two wire sensor and stillget the same code. Changed the plug to the sensor and the shaft to the three wire sensor and now get the p0340 code. you name it and I have tried it connect reconnect wiggle 1500 rpm idle test. clear code sometimes comes on right away 0r in a range of 5,10,30,50,100 miles. can a bad timing gear trip this code or should i keep with the wiring and shaft. kind of out of ideas any help or ideas would be great.
Thanks
Dave
Thanks
Dave
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Post Fiend
Joined: Jan 2003
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From: Connecticut
Welcome.
The 1998 4.0L utilizes Sequential Electronic Fuel Injection (SEFI) which means that the fuel injectors fire seperately in each individual cylinder (as opposed to the earlier "batch feed" EFI systems which fire all the injectors on one side of the engine at the same time). The camshaft position sensor (CMP) is much more critical in the SEFI systems since it's used to "time" the injectors. The '98 system requires a 3-wire sensor, so it sounds to me like you probably got an older engine on the swap, and it didn't have the proper CMP setup.
When you replaced the CMP synchronizer shaft did you make sure the #1 cylinder was at DTC and use the special tool to ensure the timing remained correct?
The 1998 4.0L utilizes Sequential Electronic Fuel Injection (SEFI) which means that the fuel injectors fire seperately in each individual cylinder (as opposed to the earlier "batch feed" EFI systems which fire all the injectors on one side of the engine at the same time). The camshaft position sensor (CMP) is much more critical in the SEFI systems since it's used to "time" the injectors. The '98 system requires a 3-wire sensor, so it sounds to me like you probably got an older engine on the swap, and it didn't have the proper CMP setup.
When you replaced the CMP synchronizer shaft did you make sure the #1 cylinder was at DTC and use the special tool to ensure the timing remained correct?
Last edited by Rockledge; Nov 20, 2005 at 02:42 PM.
Post Fiend
Joined: Jan 2003
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From: Connecticut
Originally Posted by RangerPilot
And when they swapped engines did they swap the computer? That could create some problems.
But then again, I've heard of stranger things happening in the automotive world.
Last edited by Rockledge; Nov 20, 2005 at 05:00 PM.
Post Fiend
Joined: Jul 2005
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From: Durant, OK (SOSU)
Yeah, I would be thinking the new computer would not work real well with the old engine.
Random: would the new computer think individual injection and the engine be set for batch fire injection? Just thinking out loud...
Random: would the new computer think individual injection and the engine be set for batch fire injection? Just thinking out loud...
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
I don't believe there is any relevant differences between the lower intakes on the earlier and later 4.0Ls, which would mean that the injectors sit in the same position regardless. Therefore, it's only a matter of them either firing sequentially or batch-style, and that's entirely up the computer.
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