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Vac issues

Old 08-16-2008, 09:03 PM
  #1  
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Default Vac issues

Okay well I put a built motor in my car ran it on a tune from my stock motor on 10lbs and it was pulling 20'' of vacuum. Well I put my stock injectors and ecu in to pass emissions and it was pulling 20'' of vacuum. Now when I put the 750s in and 2.5 bar and got a tune I can only pull 16'' of vacuum. but here is the big problem. If i start the car to let it warm up by idling it will get to normal operating temp. if i go drive it and go to hit boost which is supposed to be 20lbs it will hit 5k and then it feels like the spark is blowing out. But if i drive for a very long time and get the engine toasty it will boost just fine. but when it boost fine my vacuum is at 19'' and runs like complete ---- if your not driving. WTF is wrong with my car? It seems to have 2 minds of its own. At times it will idle like it should but everyonce and a while it will idle like complete ---- and kill itself if i dont give it some gas. Also when driving for a long time it seems like it will surge for a quick second and then that will lead to extreme surge issues then i have to push the clutch in to stop from jerking and it will die. Ive checked vacuum lines,temp sensors, changed the coil, and plugs, tested spark cables and everything is fine, adjusted valves twice.
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Old 08-16-2008, 09:43 PM
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Default Re: Very interesting problem

Are the injector O-rings causing a vacuum leak?
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Old 08-17-2008, 12:41 AM
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Default Re: Very interesting problem

Ive sprayed break clean by the injectors o-ring but I got nothing not even a bubble. And the injectors required some lube to get into the o-ring. Im not sure what rom editor all I know is that its tuned on crome.
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Old 08-17-2008, 12:46 AM
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Default Re: Very interesting problem

Originally Posted by carfreak
Ive sprayed break clean by the injectors o-ring but I got nothing not even a bubble. And the injectors required some lube to get into the o-ring. Im not sure what rom editor all I know is that its tuned on crome.
HAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAHAHAHHAHAH









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Old 08-17-2008, 03:34 PM
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Default Re: Very interesting problem

you dont look for bubbles when spraying around the engine looking for a leak. you are listening for the engine to change rpm. when you spray flammable liquid on a vac leak the idle rpm will either drop or rise. keep an ear out for the sound and watch where you are spraying it. that will show your leak
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Old 08-17-2008, 04:14 PM
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Default Re: Very interesting problem

and use wd40 instead of brake clean... much better on the rubber lines and o-rings...

Also let them know about the vtec issues, wierd tuning issues, etc..

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Old 08-17-2008, 06:21 PM
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Default Re: Very interesting problem

Originally Posted by PhilStubbs
you dont look for bubbles when spraying around the engine looking for a leak. you are listening for the engine to change rpm. when you spray flammable liquid on a vac leak the idle rpm will either drop or rise. keep an ear out for the sound and watch where you are spraying it. that will show your leak
I know that, im just stating I didnt EVEN get a bubble. Sometimes on leaks it will bubble up around the area that has the leak.
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