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Pontiac Forum: SSEI misses coming off of Idle
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  #1  
Old June 21st, 2018, 05:21 AM
greasemonkeyjmj greasemonkeyjmj is offline
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SSEI misses coming off of Idle

Like the title says, I have a 01 SSEI, with 140k miles. There is no SES light on.Car runs good at idle, no misses, runs good on the highway. The problem is that when I come off of idle, it stutters when you first mash the pedal, it happens whether you are in gear, or in park. I can power brake the car, and it does the same think, misses coming off of idle, but clears up after it gets past a certain point. Car had a SES light on when I bought it 3 weeks ago, the upper intake gasket was blown out under the supercharger snout. I did not have the miss before I changed the intake gasket. maybe it could be a vacuum leak somewhere?
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Old June 21st, 2018, 10:21 AM
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I would think a vacuum leak or even a miss would throw a SES light.
Did you recheck the bolts after the engine completely cooled?
Can you do a fuel pressure test?
Check the vacuum line going to the fuel pressure regulator for gasoline.
You are using the stock air filter?
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Old June 21st, 2018, 10:35 AM
greasemonkeyjmj greasemonkeyjmj is offline
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I will spray some carb cleaner and check the hoses for vacuum leaks

I did not recheck the bolts after engine cooled

I think I may have a fuel pressure tester

I will check the pressure regulator hose for fuel

yes it is a stock filter

thanks
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Old June 21st, 2018, 06:08 PM
greasemonkeyjmj greasemonkeyjmj is offline
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O.K. so far this afternoon, the only thing I have gotten done was to check for a vacuum leak. I spent a long while going over every hose and connector, and intake mating area with carb cleaner and I found no vacuum leaks. I had not taken a look at the plugs yet, so I pulled a couple of them out, and this is what they Autolite APP 606 plugs look like.
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Old June 21st, 2018, 06:51 PM
greasemonkeyjmj greasemonkeyjmj is offline
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More info, I was wanting to check my fuel pressure at the rail, but apparently I dont have a fuel pressure tester.

I pulled the vacuum line from the regulator and could not see any fuel in the hose.

I did notice that it does not only do it from a idle, it will do it no matter what rpm you are at, I was at 2k and the 2.5 k and when I would push the accelerator, it would do the the same thing as it does coming from a idle.
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Old June 22nd, 2018, 11:19 AM
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is that spark plug gapped to .060?
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Old June 22nd, 2018, 12:03 PM
greasemonkeyjmj greasemonkeyjmj is offline
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Good morning,
the plugs are gapped at .060

I rechecked the torque on the upper intake bolts this morning an all were fine

I bought a fuel pressure tester and with key on engine off, I have 46 psi at the rail. with engine running I have 44 psi, I can pull the vacuum hose off of the pressure regulator while running, and the pressure goes up to 50 psi.

I tried to buy a set of plug wires, and no one in the two towns around me had any, it will be tomorrow before I can get them.

I know they are different, and I am not going to try it, but what happens if someone puts wires from a normal 3800 on the Supercharged 3800?
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Old June 22nd, 2018, 01:31 PM
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I cannt imagine the wires are made from a different material just that they could be a different length. If you have an ohmmeter you can test them, 1k per foot of wire is the standard. Have you checked the coils for loose connections or corrosion?
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Old June 23rd, 2018, 09:51 AM
greasemonkeyjmj greasemonkeyjmj is offline
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O.K. as of this morning, it feels as if the car has developed a rougher idle.

I also swapped the plug wires, and it made no difference in my problem. and the rough idle was there before I swapped the wires
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Old June 23rd, 2018, 12:04 PM
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did you pull all the plugs and none of them look fouled?
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