Ok here is the problem when I start the car
There is no ignition on the cylinder 3 & 4
and Cylinder 1&2 run very rich
Parts I change is ignition coils ,sparks
injector
And the problem is still here also there is no check engine
Fuel pressur is good and compression test is also good

Now I don't know where the problem come from ??

 

any idea

 

How do you know that its just running on those cylinders? And also does the problem fix itself after a certain amount of time? Does it always run on 2 cylinders or just startup? The car is supposed to run richer on startup my nature when cold.

Chris

 

Are you getting spark on those cylinders?

Do they come back on at all ever? How do you know those two cylinders are not working. The more details you provied the easier it is for people to help you.

 

the car is running on 2cylinder on idle and when the throtle is 100% open the rpm is only 2500 not more and when I touch the header On each cylinder 2 of them or not hot

 

I suppose you haven't tested spark on each of the plug wires have you?

Discount your fuel pump then start testing the spark on each cylinder. Place a screw driver into the plud wire and lay it down on the manifold cover. Have a buddy crank the engine and look for spark.

If you have spark on each wire then you have not correctly wired your car in some fashion. If you don't have spark you'll need to check for voltages on each coil pack to ensure that voltage is there with the ignition on.

 

^^^Try what he said first and make sure you are getting spark on all the cylinders. If you are test the injectors. Otherwise also check your MAF sensor. Clean it out with Brake Clean and make sure everything is good to go. If the MAF is disconnected you will get similar results when you rev up.

Chris

 

MAF was clean and all spark and ignition look pretty good and yes there is ignition
I also check all sensor they are good
Is it possible the problem come fromthe ECU ??

 

If your ECU took a dive you'd have bigger problems then just 2 cylinders not firing.

Pop out the fuel injectors and give them a good look over. Then try to clean them out with brake clean. Next swap the injectors around and see if different cylinders start to missfire. If so you have found out the injectors are at fault.

If the injectors are not malfunctioning see if the connection to the injector coil pack is solid. Perhaps one of the resisters isn't making a good connection though in all honesty it seems unlikely.

 

all injector are new RC750cc and clean & all conection are test and good
Now I don't knowwhat to do

 

If you have made sure that you have spark in each cylinder then I wouldn't worry about that aspect.

Time to look at fuel, new injectors don't mean that you are getting fuel into the chamber. Double check the injector wiring, if the plug is loose for some reason then you won't be getting any fuel.

It may be worth pulling all the injectors up and just turning the motor over and seeing if all of them spray.

If all of the injectors are spraying, and you have spark everywhere, that leaves you with some kind of a timing issue.

If you had a proper compression test then chances are your valves are opening and closing properly.

Check the connections to the injectors. Hopefully that's it.

 

So did this ever get fixed?