Hello
After swapping three engines into my car, it will not fire up. Everything needed for it to fire is there, but it won't!!!! uuuurrrrrggggggg
1st transplant had a bad cylinder, second had a bad head and now the third which was running before it (car) was rear ended it then became a donor for my car.
what can it be? Computer is fine, spark is there ....??????
Thanks in advance
Pedro

All gone bad! Now that is a trail of bad luck that I can only trace back to two possible reasons...one is chance/odds this happened ...the other is....well, you know.....

I could guess.

Could swapping the engines have an effect on the Crank position sensor ?
Does it turn over ?
Does it crank and not fire ?

More info please.

Fourth engine should be a charm!

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Thanks for the prompt response!!
Engine cranks but does not fire!!
My neighbors wife said crank position as well. if it is the sensor how can that be rectified?
This is a great start. I really dont want to pull this engine.
thanks again guys
Pedro

Flex plate?

You have spark? Or no spark?

Are you sure it is getting gas?

You could try some starting spray and see if that makes it run for second. If you get a backfire then timing.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

I vote for the CPS...just replaced mine.

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1999 E320 4matic really nice Wagon 135k
1981 300TD loud, rattling family car 180k (TGI sold!)
1985 500SEL gas guzzler 220k (sold)
1978 300D my first Turtlediesel (sold)437k

CPS is in the back of the engine on top. Should have seen it while motor was pulled. I might try the coil packs also.

Yes if you look down between the cam cover and the firewall you should see the CPS.

Although, if you are getting spark, would this not suggest the CPS is good ? Does the CPS dictate when the plugs fire ?

more info on the transplant.
The only difference from the other transplants is that the flex plate that is on the engine is NOT the original but off a 96 e320. Would this make a difference??
The other engines were put in they way they came from the donor yard; this one however was replaced with teh previous engine's flex plate.
fuel is reaching the cylinders and so is spark but not igniting!!!!!!!!!!
where are the gremlins!!UUUUURRRRGGGGGG

Cant be sure. But I am pretty sure that 96 to 97 was a transition year ? I remember a parts supplier saying that their were two different CPS types for that year. IE, a different flex plate ??? Does my logic work here ?

i presently have the car at an independent mercedes shop they cant figure it out should i just take it to a real mercedes stealership???

I'd ask the shop if they can figure out if the injection timing and ignition timing are correct.
Might be on to something in regards to the flywheel or flex plate being incorrect for that engine. If the segments on the flywheel are not correct for the injection (ME-SFI) computer, the injection might be all wrong. One commenter suggested trying a bit of starting fluid to see if the engine will try to run. Which is a good thing to at least try, it tells you the engine is capable of running if the fuel is available. If it doesn't even try to run on that, or you get backfiring, it tells you that the spark is out of time. Which to me would more relate to the cam timing, but it's hard to tell.

Gilly

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Spark plugs??? Can a bad gap be causing this??? uuuurrrrrrggggg