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  #31  
Old 12-17-2012, 06:08 PM
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Re: Misfire and TPS adjustment issues

Quote:
Originally Posted by svxfiles View Post
Try pinching the (1/2" inside diameter) hose,
that goes from the drivers side throttle body,
to the IAC, closed.
I wasn't able to pinch the hose shut, it was too stiff. So instead I disconnected it and plugged it with my finger. No change, still idling (smoothly this time) at 1500 rpm after a ten minute drive...
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6

Last edited by Coan; 12-17-2012 at 06:12 PM.
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  #32  
Old 12-17-2012, 08:25 PM
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Re: Misfire and TPS adjustment issues

Changed the coolant temp sensor. No change. Out of ideas except to just try a different IAC. I'm getting tired of buying unnecessary parts though...
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #33  
Old 12-17-2012, 10:09 PM
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Re: Misfire and TPS adjustment issues

This is most likely a stupid question, but how loose is/are your throttle cables?
There should be slack.
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  #34  
Old 12-17-2012, 10:24 PM
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Re: Misfire and TPS adjustment issues

Yep there is a bit of slack to them. I had the same thought as I readjusted them after installing the manifold back on the car.
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #35  
Old 12-28-2012, 04:11 PM
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Re: Misfire and TPS adjustment issues

I once again removed the throttle body and IAC valve and cleaned them both out. I let the IAC soak in cleaner overnight this time. I still have a high idle that bounces around sometimes. The car is running fantastic other than that.
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #36  
Old 12-28-2012, 07:29 PM
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Re: Misfire and TPS adjustment issues

Quote:
Originally Posted by Coan View Post
I once again removed the throttle body and IAC valve and cleaned them both out. I let the IAC soak in cleaner overnight this time. I still have a high idle that bounces around sometimes. The car is running fantastic other than that.
This thread has grown long, did you check the ground for the intake manifold at the back pass side near the nipple for the fpr?
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  #37  
Old 12-28-2012, 09:49 PM
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Re: Misfire and TPS adjustment issues

Yeah it's getting way too long. Need moar resolution...

Oh and that ground looks good...
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #38  
Old 12-29-2012, 12:32 AM
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Re: Misfire and TPS adjustment issues

Quote:
Originally Posted by Coan View Post
Yeah it's getting way too long. Need moar resolution...

Oh and that ground looks good...
Evan if it looks good, take it apart, wire brush it, cover it with dielectrical grease and put it back together.
Other than the battery ground that is the most important ground.
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The first SuperCharged SVX,
the first 4.44 gears,
the first equal length headers,
the first phenolic spacers,
the first Class Glass fiberglass hood,
the first with 4, 4.44s in his driveway


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My locker
4.44 Swap link
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  #39  
Old 12-29-2012, 04:08 PM
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Re: Misfire and TPS adjustment issues

This is my same scenario.
I have done alot of the same things.
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  #40  
Old 01-03-2013, 05:33 PM
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Re: Misfire and TPS adjustment issues

I just went and checked on the ground with an ohmmeter to be sure. It measured .01 ohms between that ground wire and the manifold, and the same from the manifold to the negative battery cable.

I haven't done much on the car for a few days. I've been a little discouraged about it to say the least.

I did notice the a/c compressor making some intermittent squealing noise from the pulley while idling. I wonder if the bearings are going bad and causing an extra load intermittently, resulting in an unstable idle? Or does that just sound totally crazy?

Edit to add: I hear the squeal from the a/c compressor/belt at startup too (very loudly). It's been doing that for a while, but just now was able to pin it down the the a/c compressor while hearing it at idle.
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6

Last edited by Coan; 01-03-2013 at 07:06 PM.
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  #41  
Old 01-04-2013, 08:54 AM
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Re: Misfire and TPS adjustment issues

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Originally Posted by Coan View Post
I did notice the a/c compressor making some intermittent squealing noise from the pulley while idling. I wonder if the bearings are going bad and causing an extra load intermittently, resulting in an unstable idle? Or does that just sound totally crazy?
After thinking some more about this, it could possibly explain my stumble, but not the high idle...
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #42  
Old 02-27-2013, 11:44 PM
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Re: Misfire and TPS adjustment issues

Back at this again. I removed the MAF Monday night and took the cover off. I checked all of the connections with an ohm meter and they were perfect so I didn't resolder anything and put it back together.

Yesterday I finally got the CEL to come on. The codes are P0301 (cylinder 1 misfire detected) and P0306 (cylinder 6 misfire detected).

My Actron OBDII scanner also has "inspection & maintenance monitors" that test the operation of emission-related systems or components and detect out-of-range values. It came back showing that for the EGR system the "required driving conditions for that monitor have not been completed or it did not pass."

So I guess the next move is to remove the EGR to clean it out and check the connections.
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6

Last edited by Coan; 02-27-2013 at 11:56 PM.
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  #43  
Old 03-21-2013, 08:37 PM
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Red face Re: Misfire and TPS adjustment issues

My wife and I came home on Monday with a newborn baby... I started the SVX and backed it out of the garage so that I could pull the other car in the garage. It had a very metallic sounding tick coming from the engine bay that increased with RPM.

Sigh... The timing of this couldn't have been worse. Of course I have no time to work on it at this point. I haven't been able to drive it on a regular basis since October, and it's getting to the point that I really need something else to drive. As much as I love this car, it's not looking good right now...
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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  #44  
Old 03-21-2013, 08:55 PM
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Re: Misfire and TPS adjustment issues

Congrats!
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  #45  
Old 08-01-2013, 07:57 PM
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Re: Misfire and TPS adjustment issues

Still have not found the cause of this. I have not worked on it much since March, but am thinking about getting back to it now.

I made an EGR block off plate and installed it where the EGR pipe connects to the intake just to see what happens. Did not change a thing. The car still idles at 1500 warm with a misfire. Runs great above 2000 rpm.

The fact that the EGR block off plate made no difference, does that rule out an EGR issue?

Here's the latest from the OBDII scanner:
Codes
P301 misfire cylinder 1
P306 misfire cylinder 6

System monitors not meeting operating conditions:
EGR
Catalyst

Any fresh ideas?
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1997 SVX LSi Bordeaux Pearl
1995 SVX L AWD Polo Green - 277k miles
1986 Pontiac Fiero 3.4L Twin Dual Cam V6
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