Ok, My friend has a jeep liberty with a 3.7 in it. we changed the engine out and now it will not start. I pulled out the plugs and they are soaked with fuel. and I smelt the oil and it smells like gas. It would not start so he crank and cranked on it. Found out that the ground for the coil wires was broke and was not getting any spark. I changed the oil and put new plugs in. But it still will not start. I think that all the fuel washed the cylinder walls and now it can not build up compression. can I just put some oil in the spark plug holes or what? thanks

1 teaspoon of oil in each plug hole.

Even without total compression it should fire....what about timing? Are you getting any backfire, or ignition of any kind.

Just 'To Check," put a "Compression Gauge" into it & see what it's got. even it it didn't have any rings , it would have "Something".

It back fires thought the intake sometimes. I need to do a compression check.

Yes....that's how it knows when to fire the plugs.

What are the odds that the crank ring for the crank shaft sensor on the crank is different. That would suck.!!!!

If the Jeep and the Dakota are different years, it's probably possible that the reluctor rings are different. (I know they have changed year to year on GM engines.)
I would expect them to be the same if the engines are the same year.

I'll add that this is all just speculation. I'm not familiar with the 3.7s.

[This message has been edited by Raydar (edited 12-12-2010).]

I did a compression test and it had 175psi on every cylinder.

Timing is way off. Really slow timing will build up a lot of unburned fuel in the oil that bleeds past the rings. Get the timing right and change the oil.

I will look it up in the morning, but on the 4.7 and 3.7 engines, they changed relucter wheels several times and they are not compatible.
The only way to change the reluctor is to pull the crank.

Gene

What year is the Liberty??

liberty is a 2003 and the dakota is a 2004. thanks

ok install new crank sensor still nothing. I got two codes po340 and p1391. thanks

I might be missing it but I don't see anywhere that you actually checked for spark. Pull a plug wire and put it so you can see it spark from the end of the wire to ground. Have the spark plug wire at least 3/8" away from the engine ground so you can see a nice longer big zap spark.

So are you getting a spark, and is it a loudish blue spark?

[This message has been edited by phonedawgz (edited 12-15-2010).]

I have not checked spark yet. I just assumed that since it was back firing that it had spark. Also can bad fuel or old fuel cause this. The jeep has been sitting with just an 1/8 tank in it for about a year or so. I added 3 gallons of good gas to it. thanks

Ok, there is the problem. The two engines have different reluctor wheels on the crankshaft and do not interchange. The only options you have are to get the proper year engine, or pull the crankshafts from the two engines and change the reluctor wheels. There is no other option. Well I guess you could look into swapping the whole ecm/electrical system, but I am not sure what other gremlins that may produce. The 04 engine is 04 only and that is why they are more expensive than the others.

Sorry for the bad news, but if you search liberty reluctor wheel in your search engine, you will find many others who did the same as you and other than the cures I listed, nobody has made one run.

Gene

[This message has been edited by scrabblegod (edited 12-15-2010).]

could someone just change the timing program in the pcm.

quote Originally posted by fierofan25: could someone just change the timing program in the pcm.

No.

so i am going to pull the engine again and change the crank reluctor wheel and the cam relutctor wheel. I found out that that the exhaust valves, rockers and valve springs are different. does anyone see a problem with those being different. he only has 1200$ in the engine and a new one is 2500 to 3000$ and a used 2003 engine is near impossible to find. It is vehicles like this that makes me love my fiero that much more!! Anyone see the movie pinapple express it has a fiero in it.just seen it today and thought that it was cool.

bump

I did it!!!!!!!
I pulled the crank out and changed the reluctor wheel on the cam and crank. I put it all back togather and it runs.Thanks guys for all your help. Now I can work on my 3800 swap. Lonnie

quote Originally posted by scrabblegod: Sorry for the bad news, but if you search liberty reluctor wheel in your search engine, you will find many others who did the same as you and other than the cures I listed, nobody has made one run. Gene

Cool cool cool

good to hear, so i guess you got the timing chains on ok, and set up correctly, as it runs and didnt bend any valves good to hear...