Engine replacement problems

[douge36]

Really, the guy at the auto parts place was adiment that there was two. I'll check and see if that's in my manual and show him. I looked this morning and could not find any more wires. I knew the guy was mistaking.

[YtseJam454]

Damn dude, you went about this all wrong...sounds like you had a map sensor problem. The MAP is your engine load sensor, this is your main fuel metering input to the PCM. A broken vacuum hose to the Map will do the same thing.

[douge36]

Originally Posted by YtseJam454

Damn dude, you went about this all wrong...sounds like you had a map sensor problem. The MAP is your engine load sensor, this is your main fuel metering input to the PCM. A broken vacuum hose to the Map will do the same thing.

Nope, didn't work. Still idles rough and still blowing blk smoke. The only thing left is Idle control and Elec control module. Next payday!! I spent $300. this payday on it all ready.

[YtseJam454]

Slow down man, stop throwing parts at this thing! If you're problem is rough idle and black smoke it's definitely an over fueling problem. Do you have access to a scan tool? If you could list off your values on your datastream with it running we can help you nail down your problem. Does it do this when it's first started? How soon does it start to run bad?

[douge36]

Originally Posted by YtseJam454

Slow down man, stop throwing parts at this thing! If you're problem is rough idle and black smoke it's definitely an over fueling problem. Do you have access to a scan tool? If you could list off your values on your datastream with it running we can help you nail down your problem. Does it do this when it's first started? How soon does it start to run bad?

Yeah, Im done throwing parts at it. I finally broke down, swallowed my pride and called Chrysler for an appointment. I have spent more in parts than I think Chrysler would have charged me to diagnose and fix it.
When it starts it runs rough. It blows black smoke. It's not as bad as what it was since the new parts are on but the smoke is still there none the less. The idle becomes fairly smooth but the engine just sets in there and rocks back and forth on its mounts. I let it warm up and when I put it in drive or Rev. it sputters and the RPMs drop to near 0, it shutters and acts stupid and it will not move. So idling is fine but driving and reverse wont work. The tranny is brand new, 200 miles on it. The engine I bought had only 80k miles. I have replaced almost every sensor so I don't think those ar the problems.

[YtseJam454]

Are you sure you have the firing order right?

[douge36]

Originally Posted by YtseJam454

Are you sure you have the firing order right?

Yeah, I went out and rechecked them, they're all in order. I took the front end of the engine apart and checked the timing chain a few weeks ago and it was fine. Maybe the coil? Maybe the coil isnt throwing enough juice to the plugs to burn the fuel properly and therefore it's reading too rich? I think I'll throw a coil on there and see what happens.

[douge36]

Ok, I took an old spark plug and unkooked #1 plug wire and plugged in the old plug and checked the spark. #1 was a really dull yellow spark as were 2-8 with a new spark plug. Maybe coil or PCM?

[douge36]

I had the coil checked, it was within perameters. What else controls spark strength? What about the Cam Positioning Sensor and the ECM? I'll do the wires tomorrow and see what happens.

[neon_rt]

Maybe I missed it but, when you installed your new engine, did you put only the motor in (with head of course) and then put on the manifold and FI from the old engine?
If you used the Intake/TB and FI from the newer engine, that may be your problem. You should keep anything that has to do with ignition and FI from the original engine, as the sensors from another year may not be compatible.

I had a problem similar to yours on a transplant that I did. I told the mechanic to put my old manifold (TBI) in the new engine, he did not think that was nessesary, the engine would idle but had no power, I had to change it myself b/c he did not believe me. After changing the intake (with the TBI on it) it ran the way it was supposed to.
It turns out that my car was CA emission and the engine was FED.

[douge36]

I didn't change the manifold no. The throttle body yes. I guess I should go and see if the j/y still has my old engine. Before I took the engine back I did check to make sure everything was exactly the same. The only difference I could see was that the fuel rail was different. I checked with the local parts store to make sure the coil, dist., injectors etc was all the same parts numbers. As I replaced the sensors I checked to make sure the parts numbers inter mixed between the 94-95 5.2 and each one did. I'm kind of leaning towards the PCM right now. My alarm quit working, which is nice because I got tired of that noise. My spark is very very weak. I think I may have done something to the computer when I did all of this.

[dksob81]

douge,

did you change the fuel rail... the 95 and later 5.2l don't have the fuel pressure regulator on the rail, which would mean you wouldn't have pressure regulator at all...... = too much fuel..
l

[douge36]

I did change the fuel rail yes but the injectors were the exact same part # as the 94 so I left them. I also changed the fuel pressure regulator.