S5 NA swap starts and then dies
02-10-09, 04:14 PM
#1
S5 NA swap starts and then dies
Hi guys,
Maybe you could give me a hand. Most of my experience is with 1st gens (GSL-SEs mainly).
I helped a friend drop a complete S5 NA engine (factory EFI etc.) into his 1st gen (GSL-SE). The car starts okay, but will not idle. You can keep it running if you pump the throttle, but does not run smooth even at a fixed (higher rpm) throttle input. I'll try to give as much detail as I can:
- N351 ECU
- N350 AFM and pressure sensor
- S5 OMP connected
- S5 harness, came off running S5 NA as far as I know, but appears to have a knock sensor plug (under the UIM, near the primary injectors..circular plug, single pin)
Timing should be good. I restabed the CAS to make sure. Spark on all plugs and plug wires connected correctly. Fuel system is essentially new (cleaned/sealed tank, new pump, new filter, cleaned injectors, new softlines).
The only code that I get is the fuel resistor relay code (51). This is because I do not have a fuel resistor realy connected. I'm using the GSL-SE circuit opening relay and am controlling it from the 3k terminal. I am using a jumper in the fuel pump tester connector to make sure that the fuel pump remains running after the engine starts. Fuel pressure tested good as well.
To me, it seems like a vac leak, but I have not been able to locate one. I am not able to keep it running long enough to warm up to adjust the TPS. Anouther thing, it was running open headers (RB dual outlet) until a section of the exhaust could be fabbed (friend needs to run a cat).
Tested the resistance of the BAC and AWS and both tested fine.
Just wondering if there is something that I might be overlooking.
Currently the car is back with my friend. I won't be able to help him for a while since I will be leaving to Europe for 3 months, but if you have some ideas, he can test or it will give me something to check when I return.
One other thing is this engine has sat for a long time (7-8 years). It might just be that the seals are sticking a bit..at least might be part of the problem.
Thanks, guys. Sorry for the long post, but more detail, the better for this kind of stuff. If I just say, "Help. My car doesn't run! " I don't think you could help me much.
Kent
Maybe you could give me a hand. Most of my experience is with 1st gens (GSL-SEs mainly).
I helped a friend drop a complete S5 NA engine (factory EFI etc.) into his 1st gen (GSL-SE). The car starts okay, but will not idle. You can keep it running if you pump the throttle, but does not run smooth even at a fixed (higher rpm) throttle input. I'll try to give as much detail as I can:
- N351 ECU
- N350 AFM and pressure sensor
- S5 OMP connected
- S5 harness, came off running S5 NA as far as I know, but appears to have a knock sensor plug (under the UIM, near the primary injectors..circular plug, single pin)
Timing should be good. I restabed the CAS to make sure. Spark on all plugs and plug wires connected correctly. Fuel system is essentially new (cleaned/sealed tank, new pump, new filter, cleaned injectors, new softlines).
The only code that I get is the fuel resistor relay code (51). This is because I do not have a fuel resistor realy connected. I'm using the GSL-SE circuit opening relay and am controlling it from the 3k terminal. I am using a jumper in the fuel pump tester connector to make sure that the fuel pump remains running after the engine starts. Fuel pressure tested good as well.
To me, it seems like a vac leak, but I have not been able to locate one. I am not able to keep it running long enough to warm up to adjust the TPS. Anouther thing, it was running open headers (RB dual outlet) until a section of the exhaust could be fabbed (friend needs to run a cat).
Tested the resistance of the BAC and AWS and both tested fine.
Just wondering if there is something that I might be overlooking.
Currently the car is back with my friend. I won't be able to help him for a while since I will be leaving to Europe for 3 months, but if you have some ideas, he can test or it will give me something to check when I return.
One other thing is this engine has sat for a long time (7-8 years). It might just be that the seals are sticking a bit..at least might be part of the problem.
Thanks, guys. Sorry for the long post, but more detail, the better for this kind of stuff. If I just say, "Help. My car doesn't run! " I don't think you could help me much.
Kent
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
LunchboxSA22
2nd Generation Specific (1986-1992)
37
10-26-15 10:53 AM
The Shaolin
2nd Generation Specific (1986-1992)
9
09-14-15 07:50 PM
