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Vacuum Advance/Idle trouble.


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#1 Eddie Boston

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Posted 06 April 2017 - 12:32 PM

Hello everyone,

I'll get straight to the point. I read about Starion/Conquest sputtering/pulsing when you get on the throttle, and it turned out to be the Vacuum Advance that go bad.

My car did the same, and sure enough it turned out to be the vacuum advance.

I have now replaced the vacuum advance and the car ran great for a short period of time.

At Idle, the rpms randomly started jumping like crazy, and sometimes turns off on it's own very rough.

I drove the car around the block, ran good at first, and then lost power, and then gained power very quickly.

I was very worried the car was going to break down on me in the middle of traffic, so I decided to park it and give it some time to work itself out. It didn't.

Against my better judgement, I decided to take the car on the highway and give it some gas. The car runs strong when I pushed it, and revved well. No sputter or hesitation. A little slow going up on rpms, but smooth.

The car didn't do this before with the old vacuum advance.





#2 Eddie Boston

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Posted 06 April 2017 - 12:35 PM

I did notice that the distributor was a bit dirty in the inside. But again, with the old vacuum advance, it didn't do this.

#3 stesir

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Posted 06 April 2017 - 01:02 PM

O2 sensor?

#4 Eddie Boston

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Posted 06 April 2017 - 01:07 PM

View Poststesir, on 06 April 2017 - 01:02 PM, said:

O2 sensor?

I did order a new O2 sensor. But could that really cause that much trouble?

#5 tsi_tom

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Posted 06 April 2017 - 02:39 PM

Does the vacuum advance hold vacuum?
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20 over forged pistons
Stock injection system

My restoration project: The Missouri Project

#6 Eddie Boston

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Posted 06 April 2017 - 03:45 PM

View Posttsi_tom, on 06 April 2017 - 02:39 PM, said:

Does the vacuum advance hold vacuum?

Hi Tom,

Yes it does. I checked it on the car.

#7 Eddie Boston

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Posted 06 April 2017 - 03:52 PM

I just got the car back from a local garage that I've been using, and it seems to run a little better. The timing was off just a bit, and it made a noticeable difference.

It still stalls a little, but not as bad.

I got the timing, water pump, oil change, and power steering pump done.

I think it might be the distributor. It looked like it had a bit of gunk.

When I changed the Vacuum Advance, the part that it hooks on to was a bit hard to move back and forth.

I think that part is having a hard time moving back and forth with the Vacuum Advance, due to all the time it hasn't been moving.

What do you guys think?

Edited by Eddie Boston, 06 April 2017 - 04:00 PM.


#8 Eddie Boston

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Posted 06 April 2017 - 03:58 PM

Before I changed the vacuum advance, my turbo wouldn't boost properly. So I adjusted the turbo actuator to have slightly more preload.

I regret having installed a BOV because the shop that did the job, did a sloppy job and had turbo leak from the BOV.

I had to go in there and tighten everything up myself.

Edited by Eddie Boston, 06 April 2017 - 04:00 PM.


#9 tsi_tom

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Posted 06 April 2017 - 05:51 PM

It is possible your mechanical advance is stuck or sticking.  Also measure the resistance of the lockup coil.  Distributors can be rebuilt.  Look at my restoration thread in my link.  Perhaps some still has the PQ rebuild page .  That is what I used.

Other thing I recommend is send in the injectors out to be cleaned.
Engine
20 over forged pistons
Stock injection system

My restoration project: The Missouri Project

#10 Eddie Boston

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Posted 06 April 2017 - 07:21 PM

View Posttsi_tom, on 06 April 2017 - 05:51 PM, said:

It is possible your mechanical advance is stuck or sticking.  Also measure the resistance of the lockup coil.  Distributors can be rebuilt.  Look at my restoration thread in my link.  Perhaps some still has the PQ rebuild page .  That is what I used.

Other thing I recommend is send in the injectors out to be cleaned.

Thank you Tom. I think you are right about the mechanical advance sticking. I will look into the rebuild thread.

Where can I send my injectors to be cleaned? I will try to look up for shops in my area. I have (Injector Clinic) Fuel injectors.

#11 tsi_tom

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Posted 06 April 2017 - 08:03 PM

Post a picture of your injectors in the throttle body.  I can see if they are leaking external or were at one time.  rceng.com is where I sent mine but they won't clean them if they are leaking.
Engine
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Stock injection system

My restoration project: The Missouri Project

#12 scott87star

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Posted 06 April 2017 - 08:56 PM

A video of the problem would help.
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#13 Eddie Boston

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Posted 07 April 2017 - 04:41 AM

I will try to take photos, and video today. I also just found that my BOV is getting vacuum from the #1 port of 3.

I was reading a thread that said it should be hooked up to the port in the right, if your looking at it from the driver side.

I will also try to change this before I make a video. Heres the link below.

http://www.starquest...opic=151238&hl=

#14 Eddie Boston

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Posted 07 April 2017 - 01:37 PM

IMG 3106
IMG 3107

IMG 3108
IMG 3109


I took a video and will be posting link shortly.

#15 Eddie Boston

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Posted 07 April 2017 - 01:47 PM

Alright. So I drove the car this morning and all seemed well.

I redirected my BOV vacuum line.... And all of a sudden the car starts boosting like crazy! I felt awesome!

But then the car started to struggling for idle, and it was worse this time around.

I really hope it's just the distributor. I also think the vacuum lines maybe a bit out of order.

Where should I hook up my BOV vacuum line on a stock Starion?

#16 tsi_tom

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Posted 07 April 2017 - 01:52 PM

Those aren't the stock injectors.
Engine
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Stock injection system

My restoration project: The Missouri Project

#17 Eddie Boston

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Posted 07 April 2017 - 01:54 PM

Ok I got the video uploaded to youtube. Heres the link. https://youtu.be/jWN4wbbSe7s

I problem happens closer to the end of the video. I had to stop recording because it was getting to hard to keep the car running, and record at the same time.

#18 Eddie Boston

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Posted 07 April 2017 - 01:57 PM

View Posttsi_tom, on 07 April 2017 - 01:52 PM, said:

Those aren't the stock injectors.

When I bought them at the time, they said it was the same cc's as the originals. They fit just fine on the car now.

#19 tsi_tom

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Posted 07 April 2017 - 02:05 PM

I have avoided those as some members have had problems.
Engine
20 over forged pistons
Stock injection system

My restoration project: The Missouri Project

#20 Eddie Boston

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Posted 07 April 2017 - 02:14 PM

View Posttsi_tom, on 07 April 2017 - 02:05 PM, said:

I have avoided those as some members have had problems.

Really!? Why is that?

What type of fuel injectors should I get for my stock Starion? I can't find OEM fuel injectors.  

Also have you seen my video?

Edited by Eddie Boston, 07 April 2017 - 02:28 PM.





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