OK GUYS HERES MI PROBLEM I PUT A (STREET PORTED)REBUILD S5 TURBO MOTOR ON MY 87 SE

AND IM HAVING HOT START ISSUES,THE CAR STARTS FINE FIRST THING IN THE MORNING BUT WHEN ITS WARM IT WONT START,IT ONLY START IF I USE THE FUEL CUT OFF SWITCH HERES A LIST OFF MY MODS SO MAYBE YOU CAN HELP ME OUT GUYS THANKS BY THE WAY I DID A COMP. TEST AND ITS 95 PSI IN ALL FACES

ENGINE EXHAUST

S5 TURBO LONGBLOCK 3 INCHES DOWNPIPE

STREETPORTED NO CATS

RA APEX SEALS BORLA CAT BACK

OEM APEX SEAL SPRINGS

SOLID CORNER SEALS

OEM SIDE SEALS

OEM SIDE SEALS SPRINGS

RACING BEAT REGULATOR

FUEL

THIRD GEN PUMP

2 550 AND 2 720

HKS AFC

HKS FCD

 

How many miles on this rebuilt engine>

 

Did you do that compression check when it was cold? Sounds like you have some vacuum leaks, old plugs/wires, and possible leaking fuel injectors..

 

only 200 road miles but around 80 hours on my engine stand and yes i did the compression test with a cold engine,today i drove 25 miles on the city stop and go then on the highway and it was doing okay i parked at the mall shut the car off wait 5 minutes try to start the car up and the same thing happen again,im going to change my water thermo sensor,computer,clean up the injectors and change all the hoses and see what happens,thanks guys

 

Compression tests on a cold engine will be exaggerated, and cranking speed also has a big effect.



I for one, believe that hot-start flooding is most likely due to low compression.



Let's hear your warm compression results.

 

with the engine hot and cranking really slow(tic,tic,tic)i get 3 even bounces off 35 psi on both rotors,if i crank the motor faster i get 80 psi readings on all faces,any other ideas

 

Is this engine bridgeported like your signature says?

 

NO THATS MY OTHER SE,THE ONE WITH THE PROBLEM ITS JUST STREETPORTED

 

If you were near me I'd test it for ya.



IIRC for about every 5 revs comp. is increased/decreased 1.0psi. Some of my graphs don't come to zero and this is due to a slight shift in adjusting to 250rpm.



If you're getting around 80 spinning it at a decent rate it doesn't sound like your compression is that bad. You need a real accurate rev counter if you're doing it with a manual gauge. I may go too far but that's just me.



Cheers