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Rough idle with new injectors?

 
Old Jul 21, 2017, 04:06 PM
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Originally Posted by 2winscroll View Post
Oh yea make sure your fuel pressure regulator solenoid is disconnected, run your vacuum hose straight to the intake manifold.

If you do all these things it will idle much better.
This makes sense since this should open the FPR to bypass fuel more at idle instead of being disconnected and not having any vacuum.
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Old Jul 21, 2017, 04:09 PM
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FPR solenoid only works on startup, it keeps the FPR from seeing vacuum until the engine is running. Has no effect once the engine is running.
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Old Jul 21, 2017, 07:05 PM
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Originally Posted by letsgetthisdone View Post
FPR solenoid only works on startup, it keeps the FPR from seeing vacuum until the engine is running. Has no effect once the engine is running.
Ok I guess I'm wrong again? Have you ever actually checked it to see when it stops venting to atmosphere after a cold start?
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Old Jul 21, 2017, 07:16 PM
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Actually the reason I recommend disconnecting it is they are known to leak under high boost thus lowering your fuel pressure causing a lean condition at the worst time, but I'm sure you already knew that too.

Last edited by 2winscroll; Jul 23, 2017 at 07:43 PM.
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Old Jul 22, 2017, 07:41 PM
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Originally Posted by letsgetthisdone View Post
FPR solenoid only works on startup, it keeps the FPR from seeing vacuum until the engine is running. Has no effect once the engine is running.
Good to know.
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Old Jul 23, 2017, 07:40 PM
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Originally Posted by 2006EvoIXer View Post
Good to know.
Yea it would be if it was actually true.
It does stay on for a short time after the engine has started on a cold start.
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Old Jul 23, 2017, 07:48 PM
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Originally Posted by 2winscroll View Post
Actually the reason I recommend disconnecting it is they are known to leak under high boost thus lowering your fuel pressure causing a lean condition at the worst time, but I'm sure you already knew that too.
Hummm I guess this post must be useless information? Good thing you know when it shuts off tho that's way more important than saving your motor.
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Old Jul 23, 2017, 07:59 PM
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I'm actually fairly disappointed with you evoIXer I've bent over backwards to help you with this problem and told you exactly what to do too fix it. What I've told you is no BS and will solve your idle issues. But you end up thanking someone who has done nothing but tell you wrong and miss leading info? He's not trying to help you, he's just trying his hardest to discredit certain people on this forum who have not agreed with him in the past. I tried to help but I guess since certain folks have 7000 posts they are more believable?
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Old Jul 24, 2017, 08:37 AM
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Originally Posted by 2winscroll View Post
Yea it would be if it was actually true.
It does stay on for a short time after the engine has started on a cold start.
If anyone is interested, I can easily monitor this. My boost sensor is connected to the intake manifold line and can easily switch to after this solenoid.
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Old Jul 24, 2017, 08:39 AM
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Are you confusing me with the OP?
Don't get me wrong, I am learning as much as I can because I will eventually run into this problem myself. Hopefully, I'll know exactly what to do then.

Originally Posted by 2winscroll View Post
I'm actually fairly disappointed with you evoIXer I've bent over backwards to help you with this problem and told you exactly what to do too fix it. What I've told you is no BS and will solve your idle issues. But you end up thanking someone who has done nothing but tell you wrong and miss leading info? He's not trying to help you, he's just trying his hardest to discredit certain people on this forum who have not agreed with him in the past. I tried to help but I guess since certain folks have 7000 posts they are more believable?

Last edited by 2006EvoIXer; Jul 24, 2017 at 10:50 AM.
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Old Mar 5, 2019, 01:26 PM
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Originally Posted by 2winscroll View Post
Oh yea make sure your fuel pressure regulator solenoid is disconnected, run your vacuum hose straight to the intake manifold.

If you do all these things it will idle much better.
and this only pertains to the 400 pump?
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Old Mar 14, 2019, 02:05 PM
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Originally Posted by 2winscroll View Post
Oh yea make sure your fuel pressure regulator solenoid is disconnected, run your vacuum hose straight to the intake manifold.

If you do all these things it will idle much better.
can you show pictures on what is needed to do this
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Old Mar 14, 2019, 06:57 PM
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What kind of injectors are you running? I'm running ID1300x injectors and my idle is smooth as silk even on pump gas.
Did your tuner properly set the latency and dead times? What kind of trims are you seeing at idle?
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