Question about 2002 Dodge Neon

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Engine lost power after Replacing Crank and Cam shaft Sensors?

Ok, I am STUMPED! 10 days ago I replaced the engine in my 02 Neon. Very clean Motor, looks to have been partially rebuilt, 101k miles on it. I drove it for 2 days and the only issue after replacing the motor was a slight miss or lope at idling, otherwise it ran great. On day 2 had to replace my brakes(already knew they needed done just waited til engine was installed and the car was drivable.) After replacing the front rotors and pads I took it for a test drive to make sure they were bled out and functioning properly. During the test drive I noticed a VERY slight **** occasionally at speeds of 35-50. The next morning the car wouldn't start, no spark at all. After checking EVERYTHING externally on the engine, I ran a home diagnostics test and got several codes. I also had it towed to a shop and they ran their tester as well and came up with the same trouble codes as I had. Mechanic also looked over the engine externally, even checked all wires for breaks or wear/tear. I then replaced the Cam and Crank shaft Sensors and ignition Switch, these were the ONLY 3 codes that popped up when the Computer was tested.

NOW, the car starts smooth as butter, still has slight miss/lope,but fires everytime and stays running. The problem now is that it has NO power. I can start it right up, but when I engage the transmission, the car will hardly move.( NOT transmission related). It's very sluggish on take off, I am lucky to get it to move 5-10MPH in ANY gear. Does anyone have ANY ideas? I am trying to fix this myself and not go broke! Today I am going to change plugs and wires, even though the current plugs and wires are almost brand new(used for 2-3 months on Original Engine) and possibly change the Coil, I have the one off my old blown engine that I replaced last week. (This Coil functions properly, or at least it DID prior to the Engine locking up)

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If you said not transmission related, then if you have it in neutral, would you be able to ramp up the RPM without being hesitated?
1- If your answer is no, then look for leak in vacuum hose.
2- If your answer is yes then look for fuel being delivered to the fuel distributors since the air:gas ratio needs to be 14.6:1 for the engine to work smmothly, otherwise it becomes hesitated as accelerated ( as throtttle valve changing its position)

Posted on Sep 09, 2009

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Check to make sure that the front axles are really clipped into the transmission. I've seen them come out during brake jobs and if only one side is out the car will move somewhat

Posted on Sep 09, 2009

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