smokie

iTrader: (5)

Hey guys im having a little problem im doing a turbo swap (second one) and i have everything put together its a s4 87 t2 and i cant get it to start and when it does it sounds like its running off of one rotor....heres my problem the engine has compression on both rotors it has spark (new spark plugs and wires) and it has fuel (walbor 255 pump changed all the injectors) but the car wont run or it runs off of one rotor has anyone had this problem i cant seem to find anything in the fourms about it any advice would be great or if you can point me to some threads that talk about this that would be great thanks guys:

francogt1

iTrader: (2)

stock ECU? make sure you have all the plugs in the harness plugged where they should be duble check everything

smokie

iTrader: (5)

i did even did a injector pulse width test i tripple checked all wires all hoses how ever i did find a possible problem with my afm but im not sure...we tried to use fast start and sprayed at the filter but nothing so we took the afm off and sprayed in the tube and it tried to start so thats a possible problem when i switched it with a friends it tried to start but it was hard to start and it sounded like it was running on one rotor like the back rotor wasnt getting fuel or spark so for the life of me i cant figure it out i know its getting fuel but for some reason i cant figure this out

smokie

iTrader: (5)

by the way yes its a stock ecu

g14novak

iTrader: (1)

timing set correctly? not off a tooth or two?

smokie

iTrader: (5)

timming is set ummmm i doubled check for spark so its getting spark its getting fuel but the pump im using is a walbro 255 so im not sure if that could be the case mabe i should get a stock fuel pump.......when i did the compressinon check both housing were near 100 rear mabe a few off i was told it could be the computer but im not sure and also the afm im not sure of either

dot_txt

iTrader: (1)

Bad timing could do it.. although if its running on one rotor it should be running the other too.. If you have compression on both rotors, then the culprit is either your fuel or spark. Find the rotor that isn't running. Do this by pulling the spark plug wires off the rear rotor and try to start it. If it starts and sounds exacty the same then you are definitely only running one rotor. If it doesn't start repeat the process with the front rotor.

Then shut it off. Pull the plugs off the rear rotor, hook them up to their respective wires, and lay them on top of the engine somewhere making sure that the metal from the plug is touching the engine and that you can see the bottom of the plugs from the drivers seat. Then crank the car over briefly, (not enough to start it) and look for spark on those plugs. If you get spark then you know thats probably not the problem.

Also if your fuel injectors are working properly you should see a light mist of gas coming up out of the spark plug holes (have a friend look while your cranking). A real heavy mist means your rear rotor is flooded. If you don't see that mist (or if you don't smell gas) then recheck your injectors on the rear rotor.

Unless..

Is the an n374 ECU. They are notorious for not running the rear rotor because they were damaged in shipping. Try another ECU. The N/A ECU will start the engine and let you drive it gently. You may want to hook one up, if you have one lying around, just to start it and eliminate a potential cause.

Hope this helps

smokie

iTrader: (5)

we did that my god brother (been working on rotaries for 17 years) has been helping me....we did the spark thing all of the plugs are getting spark ummm we know the fuel injectors are working and i know rear was flooded when we pulled the rear sparks plugs there were more wet than the front and lots of midst came out....the computer i have is the n333 that my god brother got from a guy along with the afm wich im having this gut feeling that neither one of them are working im going to try my na comp and see if that works and im also going to check the timming ill pull the crank angle sensor out and set the timming and then put the crank angel sensor in and see if that changes it

dot_txt

iTrader: (1)

Check the ECU first. Could very well be blown.

smokie

iTrader: (5)

so i went and tried to use my na ecu and i got the same problem i did it a few times it tried to start but it still sounded like its running on one rotor and ver hard to start but i found something intresting.....i pull the spark plugs to deflood the engine and i pulled the back plugs first and notice there was a lot of fuel and oil on the back plugs but when i pulled the front plugs there were dry not a spot of fuel or anything on them and i mean there were dry