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Old 03-28-2007, 10:51 AM   #1
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Default chugging going into boost

Ok old topic that I am having problems with still.Well kinda!

I used to have a real problem with my car chugging going into boost exspecially going up hills but since I put on a new high flow cat it has all but gone away ALMOST!!!!

It is about 95% better but it is still there slightly!Since I installed the new cat it seems to run alot better but going up a hill last night coming home from work I noticed that once it was going up a hill it started to chug a little once it reached 0 on the boost gauge but is way better than what it was like before.

So I was wondering what you guys think could be the problem.Could it be that my resonator is a little plugged from the old cat,kinda of a guessing game for me right now!
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Old 03-28-2007, 11:15 AM   #2
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When was the last time you did plugs and wires... Fuel filter...

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Old 03-28-2007, 12:07 PM   #3
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This is maybe the 6th thread on the same topic over the past year. If you're going to start new threads, at least provide a list of things you've already done and if you've followed the advice in the other threads.
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Old 03-28-2007, 12:27 PM   #4
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Bearsfan, please summarize all the things you've done to troubleshoot or fix the problem suggested or discussed in each of these topics:

http://www.bonnevilleclub.com/forum/...108&highlight=

http://www.bonnevilleclub.com/forum/...344&highlight=

http://www.bonnevilleclub.com/forum/...333&highlight=

http://www.bonnevilleclub.com/forum/...653&highlight=

http://www.bonnevilleclub.com/forum/...653&highlight=

http://www.bonnevilleclub.com/forum/...962&highlight=

http://www.bonnevilleclub.com/forum/...409&highlight=

You are making it VERY difficult by forcing us to ask and suggest the same things over and over. Do NOT start another topic. Summarize everything right here, and stick with this topic ONLY until it'* fixed.
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Old 03-28-2007, 12:46 PM   #5
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I have done everything you guys have suggested to do!!!!!

I guess I should have went back to a old post and continued sorry!!!!!!!!

I just thought that since I put on the new high flow cat that you guys could maybe help me go from there seeing as it helped alot of the problem with the new cat I just put on!

But I will list everything I have done!

new plugs,coils,wires,cleaned up the ground from the battery,changed the tranny fluid and filter,new fuel filter,cleaned the throttle body new gasket too,also had the fuel pressure checked,checked all vacume lines,cleaned up the egr valve and new gasket,new o2 sensors,new cat.

No codes stored anymore and no ses light is on.

That should be almost everything I have done if there is more I have forgotten to list I will come back and list more!

Sorry wasn't tryin to make any one annoyed or mad!
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Old 03-29-2007, 08:43 PM   #6
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Did you clean the MAF when you did the throttle body? Was the old cat plugged or restricted? Was there any indication of crumbling rubber on the capped off vacuum fitting on top of the supercharger? How about the "T" under the snout of the supercharger? Did you check with throttle body cleaner, or visually? What brand O2 sensor did you buy?

Just as a test, remove the grounding strap to the body, again. Clean the threads in the body and on the bolt again, and then leave it disconnected for about 30 minutes before reassembling it.
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Old 03-29-2007, 08:58 PM   #7
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yes the cat was restricted.as for the o2 sensors I used they were ac delco.yes i did clean the maf sensor also.

as for the t under the snout it seems loose like it is not completely snug fitting.I will try the ground again and also try to locate a new T for under the snout of the supercharger.

Also the cat was so bad that it was actually crumbling inside.thats why I thought maybe some where along the line something might have worked down the exaust and there is a further restriction along the line.

Since replacing the cat with a high flow one it goes into boost alot easier meaning when it approaches o psi it goes beyond 0 psi alot easier than before if that makes sense?Before it would reach 0 psi going up a hill and have a hard time in cruise control going beyond 0 psi with out me actually pressing the pedal down to kick it into a lower gear.

I am thinking that the T under the snout may have something to do with it,if it is getting extra vacume because it is worn or old would that cause it to chug going into boost?

I will make it a point to go outside right now and do as you suggested with the ground strap.
Thank you so very much on your time and patience with me!!!!
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Old 03-29-2007, 09:50 PM   #8
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A vacuum leak can cause many problems, including the problem you're describing. That "T", and the cap on the multi-port vacuum fitting on the supercharger are known to cause problems. You'll have to make your own "T" from fittings at an auto parts store, or buy the whole assembly from the dealer.

If you're still concerned about a restrictive exhaust, take it to a muffler shop and have them do a back pressure test on it.
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Old 03-29-2007, 11:13 PM   #9
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Well I did the battery cable thing and actually got a t off of my 97 grand prix that is just sitting around.

Took the bonnie for a ride and it is still there.I guess I am going to the exaust shop tomarrow and gona do as you suggested.Thanx for all the help.I will make sure to tell ya what the shop says about the back pressure test.Also the cap on top of the supercharger seems fine no cracks or loosness.
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Old 03-31-2007, 02:17 AM   #10
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Well had a back pressure check done and all is fine.

Was talking to one of the mechanics at the shop and he said maybe it could be the boost control silenoid???

Maybe this maybe that....So if it is supercharger orientated where could I begin to look?
On a earlier post I wrote how once my idler pulley went and the supercharger belt was not hooked up anymore there was no chug and it ran smooth?Well I would think it would have to be supercharger related and when the old cat was on it just intensified it more and now there is no restriction it is better but still there,so my question is now where to look?

What associated with the */c could cause this chuging to occur?boost control solenoid,and I dunno what else is incorparated with the */c as far as sensors or solenoids?Isn't there something to do with boost dump?Could it be that when it is enetering boost it is not getting dumped correctly?What controls that?It is a guessing game right now for me and for almost a year now I have not been able to figure this out.

What about overdrive but it still will do this in 3rd too so I doubt it.Could the throttle postion sensor have anything to do with this chugging?Or the IAT sensor?What about the map sensor but I would think that if it was sensor related I would get a code correct?Or is there some codes that can not be seen with a regular scanner?

I am sure you guys are really sick and tired of me with this chug as I am with it myself!!!!
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