After Dyno problems!!!

[swerv600]

I got my ride dynoed today everything went great. Mods are all in profile. Final results of dyno after fine tune was 281.8whp and 272wtq @18psi. Now the problem started happening when I left the shop and got home, everytime I go to start the car its having a hard time starting. The car just cranks awhile then eventually starts. It starts to stumble at idle then gets normal. After the start the car drives fine tons of power now, but the hard starting is killing me. I'm clueless on what can suddenly cause this?

 

[L'ville]

Not sure but check your plugs & wires . What kind of plugs are u running and what kind of wires?

 

[drewvr4]

so you had power steering before and now you dont?

check the belt, see if fluid is in there.

now it sounds like your getting too much fuel in start...lots of dsms have these problems. If you dont have a FPR get one, that will probably fix your problem right up

 

[swerv600]

I'm running ngk's BPR7ES and 8.5 magnacores. I also have the b&m fpr w/gauge set @ 40.

 

[GVR4592]

Fuel pressure should be 43 psi with the vacuum line off.

 

[GILZTSIAWD]

Fuel pressure should be 43 psi with the vacuum line off.

^^ Like he said. But then again I don't think I would mess with it since you just got it dyno tuned, that will mess up your tune. I would check the plugs, they might need replaced after some hard dyno runs. Afterall they are only like $1.50 each. Also check and see how long it takes for you to lose fuel pressure after you shut off the car. Sounds like it might just be taking a minute to get the gas up to the injectors. Other than that it might be your isc, and I am sure a million other possibilites. Pump gas or race gas on the dyno?

 

[swerv600]

pump 93oct

 

[GILZTSIAWD]

ok, I was thinking maybe you ran race gas and messed up your O2 sensor.

 

[PieEyedPiper]

is it possible your car was mis-tuned at the idle rpm range?

 

[GVR4592]

^^ Like he said. But then again I don't think I would mess with it since you just got it dyno tuned, that will mess up your tune. I would check the plugs, they might need replaced after some hard dyno runs. Afterall they are only like $1.50 each. Also check and see how long it takes for you to lose fuel pressure after you shut off the car. Sounds like it might just be taking a minute to get the gas up to the injectors. Other than that it might be your isc, and I am sure a million other possibilites. Pump gas or race gas on the dyno?

It won't hurt to adjust the fuel pressure to 43 psi and see if the problem goes away. He can always turn it back down to 40.

 

[swerv600]

Alright I replaced the plugs and it fired right up, but the next day it did it all over again. It would crank for like 4-5 seconds and then start, but when it starts it bogs out like it wants to die but doesn't.

 

[spyderturbo007]

Did you happen to replace the FP recently?

 

[olmytsi]

Is the car down on power?

 

[swerv600]

I replaced the FP about 4 months ago and the car has alot of power.

 

[swerv600]

Now when the car starts it bogs down like it wants to shut off, then a puff of black smoke comes out then goes away when idle starts to go up. Its not throwing out codes.

 

[jking29]

Check to make sure the fuel system holds pressure. Sounds like an injector is leaking.