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Old 05-31-2011, 05:20 PM   #26
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man this sucks Randy.....hope you figure it out

i think your new nickname is Schleprock from the flintstones... remember him?
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Old 05-31-2011, 05:21 PM   #27
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Quote:
Originally Posted by Speedy1975 View Post
Are you seeing any CEL codes? Typically with any VAC leak you'll get a CEL especially if it's bad enough to cause the engine to idle erratically.

Is it just a bad idle (erratic) or are you sure it's a true miss of the engine?

Did you post up video?
I did post a video. Let me go get it and post it here.


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man this sucks Randy.....hope you figure it out

i think your new nickname is Schleprock from the flintstones... remember him?
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Old 05-31-2011, 05:25 PM   #28
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Old 05-31-2011, 05:29 PM   #29
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If you have an air leak, you should be able to hear it.

Stupid simple question: Have you checked for a fouled plug, or have you made sure you have the right gap/hot for your car with your supercharger?
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Old 05-31-2011, 05:31 PM   #30
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Quote:
Originally Posted by Speedy1975 View Post
Are you seeing any CEL codes? Typically with any VAC leak you'll get a CEL especially if it's bad enough to cause the engine to idle erratically.

Is it just a bad idle (erratic) or are you sure it's a true miss of the engine?

Did you post up video?
Oh, ya. I had gotten the random misfire code. P0300

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If you have an air leak, you should be able to hear it.

Stupid simple question: Have you checked for a fouled plug, or have you made sure you have the right gap/hot for your car with your supercharger?
Have changed all the plugs.
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Old 05-31-2011, 05:33 PM   #31
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Oh, ya. I had gotten the random misfire code. P0300

Have changed all the plugs.
You're certain they're the right plugs and that they're gapped right? You didn't drop one or bang one and mess up the gap? I've done this, and had a very similar problem.
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Old 05-31-2011, 05:35 PM   #32
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i will tell u bro go get a smoke machine and do that u will find the leak if u have one... only way to go !!.. GOOD LUCK
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Old 05-31-2011, 05:37 PM   #33
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Have the wife take a look and see if she can find anything?

You said Post it and you'd try it!
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Old 05-31-2011, 05:43 PM   #34
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Did this all start after installing the bloser?

Fuel quality? did you try bumping up the octane?

Misfires are sometimes the basics. check all the plugs plug wires and coils for proper condition, a cyinder leakdown test and compression test, bad valves and/or seats can cause the same misfire/surge effect.

Is this at low rpms or all rpms or mid to high rpms? High cyclinder pressure due to boost can require a hotter spark than the OEM can provide. High compression/pressure engines need hotter spark to keep the fire going on the plugs.

Just throwing out ideas but stay with the basics before eliminating the deeper harder to solve areas.
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Old 05-31-2011, 06:10 PM   #35
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Quote:
Originally Posted by Devryn17 View Post
You're certain they're the right plugs and that they're gapped right? You didn't drop one or bang one and mess up the gap? I've done this, and had a very similar problem.
Possitive. I actually bought 8 new plugs. TR6 plugs. One of them was bad, or I broke it inadvertently. When I changed them it was misfiring much worse. So it gave off a code. Cylinder 8 misfire. So I moved the number 8 cylinder to the number 1 spot and the 1 to the 8 spot and the code said misfire cylinder 1. Went and bought a new plug and put it in 1 and it ran fine.

Fine being the way it did before. Gapped them correctly yes. Was very maticulous in doing so.

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i will tell u bro go get a smoke machine and do that u will find the leak if u have one... only way to go !!.. GOOD LUCK
I suppose I should.

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Have the wife take a look and see if she can find anything?

You said Post it and you'd try it!
Sounds good to me. lol

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Did this all start after installing the bloser? Yes.

Fuel quality? did you try bumping up the octane? I let Vengeance set it.

Misfires are sometimes the basics. .... a cyinder leakdown test and compression test, bad valves and/or seats can cause the same misfire/surge effect. This is the most unlikely so will be last. It only reveals bad news if it's the culprit. lol

Is this at low rpms or all rpms or mid to high rpms? High cyclinder pressure due to boost can require a hotter spark than the OEM can provide. High compression/pressure engines need hotter spark to keep the fire going on the plugs.

Just throwing out ideas but stay with the basics before eliminating the deeper harder to solve areas.
Good stuff.

Only low RPMs are doing it. High RPMs are either not doing it, or are not detectable
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Old 05-31-2011, 07:24 PM   #36
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What are your fuel trims doing? Are they showing a vacuum leak?
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Old 05-31-2011, 07:39 PM   #37
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I HAVE GREAT RESULTS WITH SMOKE MACHINE IT SHOWS OFF AND YOU CAN PRESSURIZE FOR LEAKS AS REQUIRED
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Old 05-31-2011, 07:52 PM   #38
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What are your fuel trims doing? Are they showing a vacuum leak?
I don't know. Tuner didn't tell me.

He just said I have an air leak. He tuned it for the proper trims. That's all he said. And he told me I have an air leak.

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I HAVE GREAT RESULTS WITH SMOKE MACHINE IT SHOWS OFF AND YOU CAN PRESSURIZE FOR LEAKS AS REQUIRED
Ok. Meet me at the shop.
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Old 05-31-2011, 08:19 PM   #39
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I don't know. Tuner didn't tell me.

He just said I have an air leak. He tuned it for the proper trims. That's all he said. And he told me I have an air leak.

Ok. Meet me at the shop.

Do you have a scan tool? Plug it in and see what is up with the O2 readings and the fuel trims. If you are getting unmetered air into the system then your O2 should be reading lean and the computer should be adding fuel to enrich the mixture.
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Old 05-31-2011, 08:22 PM   #40
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Quote:
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Do you have a scan tool? Plug it in and see what is up with the O2 readings and the fuel trims. If you are getting unmetered air into the system then your O2 should be reading lean and the computer should be adding fuel to enrich the mixture.
I left it at Vengeance for Mike to put my tune on.
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Old 05-31-2011, 09:01 PM   #41
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Ok. Random misfire is nothing to play with on a supercharged car. I take it that's not happening now? No more codes?

I'd like to see some logs from your scan tool. The fuel trims being mentioned can point us in the right direction if there is a vac leak. Like was mentioned, if un-metered air is entering the system, the ECM will try to compensate for it by throwing fuel at it. You should see very positive fuel trims.

Did you ever have a canned Magnuson tune in the car? If not can you load it and see if the results are the same?

Were the plugs you took out of the car in there with the supercharger installed and this problem occurring? If so, take close up pictures of the tips of the plugs and post them up for us to see.

I'm not convinced it's an air leak.......yet. I'd expect to see high idle with an air leak, not a hesitation like your showing in the video.

Take some video up around the engine bay...specifically around each head and post that up as well.

Finally, 6lbs of boost or ?
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Old 05-31-2011, 10:06 PM   #42
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get rid of those plugs......put platinums back in and watch.
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Old 05-31-2011, 10:42 PM   #43
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Quote:
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Ok. Random misfire is nothing to play with on a supercharged car. I take it that's not happening now? Never got a code with a load. Only when someone reved it real hard a few times, or when the wheels broke loose if I gassed it wot from a stand still. No more codes? Not yet. But haven't had a code in forever.

I'd like to see some logs from your scan tool. The fuel trims being mentioned can point us in the right direction if there is a vac leak. Like was mentioned, if un-metered air is entering the system, the ECM will try to compensate for it by throwing fuel at it. You should see very positive fuel trims.

Did you ever have a canned Magnuson tune in the car? Yes. If not can you load it and see if the results are the same? The results were the same.

Were the plugs you took out of the car in there with the supercharger installed and this problem occurring? Yes. I just replaced them a few weeks ago. If so, take close up pictures of the tips of the plugs and post them up for us to see. See below.

I'm not convinced it's an air leak.......yet. I'd expect to see high idle with an air leak, not a hesitation like your showing in the video.

Take some video up around the engine bay...specifically around each head and post that up as well.

Finally, 6lbs of boost or ? 7.5 lbs of boost.
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I'll have to get the video tomorrow.

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get rid of those plugs......put platinums back in and watch.
They were already in.
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Old 05-31-2011, 10:52 PM   #44
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Car still in atlanta?
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Old 05-31-2011, 11:21 PM   #45
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Ok, that's three plugs. I wanna see all 8 that came outta the car. Those three look good. Gap's a bit wide for a blown car, but burn pattern looks fine.

What gap are the new plugs set to? I'm on 12psi of boost and gapped mine to .032 if memory serves.

The gap won't explain your issue since it's happening at idle, but you do want to tighten the gap just a bit on a supercharged car to keep the spark from being blown out by the boost.

Lemme see all 8 plug tips and we'll go from there.
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Old 05-31-2011, 11:47 PM   #46
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Car still in atlanta?
Nope. Drove it home.

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Ok, that's three plugs. I wanna see all 8 that came outta the car. Those three look good. Gap's a bit wide for a blown car, but burn pattern looks fine.

What gap are the new plugs set to? I'm on 12psi of boost and gapped mine to .032 if memory serves.

The gap won't explain your issue since it's happening at idle, but you do want to tighten the gap just a bit on a supercharged car to keep the spark from being blown out by the boost.

Lemme see all 8 plug tips and we'll go from there.
Ok. those pics are from the day I did it. lol

.
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Old 06-01-2011, 12:13 AM   #47
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Old 06-01-2011, 06:10 AM   #48
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My opinion is that you are not going to get anywhere until you get a scan tool on it and a smoke machine to find the leak assuming there is one.

You can chase Gremlins like this for a month and not find it.
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Old 06-01-2011, 08:01 AM   #49
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really sounds like its missing a spark. This happened to me when i put my new wires on, one wire was just not all the way snug.

I have seen vacuum leaks cause cars to idle ruff but usually the idle will be so jerky that the car will die.

Another thing you can do if your thinking leak. There are mics that listen in small areas where you can follow your lines and listen for the hiss.

Vacuum leaks can be the lines or even the valley gasket.
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Old 06-01-2011, 10:15 AM   #50
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OK, plugs look fine, so I don't think there's problems with that.

I agree that a scan tool needs to get on the car and check out some parameters.

Hook the tool up and let the car idle.

Take a look at long term and short term fuel trims. If they're very positive that could indicate a vac leak somewhere.

Take a look at O2 sensors make sure they're enabled and reporting properly.

Take a look at the timing, specifically when the hesitation occurs. See if when the hesitation occurs you see a quick dip to negative timing.

Also take a look at the TPS setting when the hesitation occurs as well to see what it's doing.

Also, do you have a catch can on the car? If so, does it fill up with oil more quickly than normal? Double check the PCV valve make sure it's orientated properly. Had a friend put one in backwards once and have some weirdness.

I'd also do the smoke machine as well.

I'd also check with Jessika at Magnuson. She's a GREAT gal and loves to help. She's also very knowledgeable mechanically, and if she doesn't know she has resources to ask. They can point you to some common areas on the blower to check for this type of issue just to cover all the bases.
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