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Old 05-10-2017, 01:02 PM   #1 (permalink)
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Default Just how screwed am I?

So I've been working on the stealth some more the past couple days. I was going to go the e85 route but I'm planning on selling the car when I get the title so I've changed my mind.
I put the 450cc injectors back in and did nothing other than what was required for that. I started the car back up. Now I'm only pulling -10 vacuum vs the 27-30 I was pulling before the injector swap. Car was running just fine before I parked it about 2 months ago.
I pulled the intake plenum and runners off to replace a with another runner because some of the bolt holes where stripped on the original and I thought that might be it. Still only -10..
I've sprayed soapy water on all the joints and no bubbles. Turned the car off and while thinking I put my hand on the timing belt and pressed on it slightly. The intake side cam gear moved slightly, so out curious it's I checked tension near the water pump and it's loose as shit..
could I have bent valves and that's why I'm not pulling enough vacuum?
I figured this was normal but I thought I would include it. When pressing the brake I pull anywhere from -15 to -20 when I let off it goes back down.
What does everyone think? I've got another set of heads but god I really don't want to do that, if I don't have to
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Old 05-10-2017, 01:04 PM   #2 (permalink)
Talk about a shortshifter
 
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Default Re: Just how screwed am I?

New gaskets?

Are you pressurizing when spraying soapy water?
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Old 05-10-2017, 01:24 PM   #3 (permalink)
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Default Re: Just how screwed am I?

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Originally Posted by Hard AttacK View Post
New gaskets?

Are you pressurizing when spraying soapy water?
Just replaced the gaskets about a week before I parked it. They maybe have 100 miles on them if that so I didn't replace them this time. No I'm not pressurizing as I don't currently have access to a compressor, however with a leak this big I should still be able to see something I would imagine. I was able to find some leaks before without pressurizing and I was pulling normal vacuum when I found those. I also just replaced the spark plugs too.
Don't think that matters but I want to include everything I've done.
I'm mainly worried about this timing belt. I want to make sure that I haven't bent any valves or anything before I try to start it again
Thank you for the quick reply too!
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Old 05-10-2017, 01:34 PM   #4 (permalink)
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Default Re: Just how screwed am I?

If the timing belt is not making noise and not moving around while the car is running its not loose.
This is a loose belt.

You need to pressurize the intake. You probably made a leak when you pulled everything apart to change the injectors.

Interesting about when you press the brakes, I wonder if your could be bad or somthing. You could try blocking off the port that goes to the brake booster and see if it makes a difference.
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Old 05-10-2017, 01:54 PM   #5 (permalink)
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Default Re: Just how screwed am I?

Thank you for that video. As soon as I am able I will pressurize. I'll try the break booster block as well.
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Old 05-10-2017, 03:44 PM   #6 (permalink)
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Default Re: Just how screwed am I?

I wouldn't suspect bent valves unless you did something to bend them.. Keep in mine the belt will have slack after it sits a little bit.

Check your hoses and make sure you've clamped down all of your IC piping and no hoses are pinched. Odds are you could have overlooked something or possibly cracked hose that needs to be replaced.
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Old 05-10-2017, 05:40 PM   #7 (permalink)
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Default Re: Just how screwed am I?

27-30" of vacuum seems excessive. Are you running stock airbox and filter?
With an open element filter you should be around 18-20".
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Old 05-10-2017, 10:00 PM   #8 (permalink)
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Default Re: Just how screwed am I?

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27-30" of vacuum seems excessive. Are you running stock airbox and filter?
With an open element filter you should be around 18-20".
I apologize I was going off of memory. I believe it was closer to around 20 ish inches now that I really think about. I believe I was confusing idle and off boost cruising at higher Rpms.
As for intake, I've got a single core 2 into 1 intercooler. Stock preturbo pipes and 3.75 inch gm maf
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Old 05-19-2017, 12:20 PM   #9 (permalink)
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Default Re: Just how screwed am I?

Alright so I pressure tested. I've got a small leak at the throttle body that only shows up around 15 psi. Other than that it's all tight. Still only pulling about 10 inches of vacuum. Check engine light came on. 22 and 12. One is for the air flow sensor and another for crankshaft position sensor.
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Old 05-19-2017, 12:33 PM   #10 (permalink)
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Default Re: Just how screwed am I?

It sounds like it may be a misfire.
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