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PostPosted: Thu Oct 29, 2015 7:43 am 
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A few weeks ago I started to notice surging, little pulses in speed at launch and cruising at low speed. Lately its been more noticeable, more often and at higher speeds. I thought I remembered a thread that said that it might be the trans. I did some more looking and read that this surging could not be caused by the transmission. from what I read the problem is the fuel system OR the cat. Now I have a bad cat no doubt. Is the bad CAT causing this?

Kris

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Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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PostPosted: Thu Oct 29, 2015 7:58 am 
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I'd check over the ignition system first.

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PostPosted: Thu Oct 29, 2015 8:19 am 
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I am not getting any codes other than the P0420 that Ive had for months. I am sure you remember getting the 420 code isolated to the cat Carl. Its $180 to me and my wife just lost half her income. I could have bought the full ZZ exhaust with cat for only $60 more than I paid for just the down pipe. So I have been dragging my feet.

Ill check plug wire connections, re-seat the coils and the ICM connector and check the plugs if I can. I'll get back atya tomorrow.

Kris

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked

ImageImage
Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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PostPosted: Thu Oct 29, 2015 8:39 pm 
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I re-seated all the connections. A couple wires needed reseating at the coils. I found cyl 4 plug was hand turn loose. I finished checking the rest and felt good about this as the answer. No such luck as the car did the same surging. I think I should pull all the plugs andook for fouling. Other than that is the ICM or the coils. What do you think Carl?

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked

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Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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PostPosted: Fri Oct 30, 2015 9:28 pm 
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I have had this problem in the past. It turned out to be the transmission....From what the mechanic said it had to do with the torque converter trying to lock up (engage) or unlock (don't remember which).... So in essence the tranny couldn't make up it's mind what mode it should be in.....One way to check....shift out of OD and see if it still happens...... Mine ran fine in "3"....but as soon as I would put it in "D"....and get to that 'sweet spot' in the RPM range a slight increase in speed (especially going up hill) and the surge would return..... Another way to check was to 'nail it'.....mine NEVER stumbled or lagged when I 'put my foot in it'.....it was the gradual application of power.....

If yours is doing that you might try taking it to a tranny shop and let them drive it....my local shop didn't charge for that but were able to verify that it was, indeed, the tranny. Wasn't a total rebuild......so it could have been worse.


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PostPosted: Sat Oct 31, 2015 2:41 am 
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Thanks for that it's at least wise to know that it could be the transmission thank you. with me ithappened at like 5 to 20 miles per hour in first gear barely accelerating just cruising along.

I swapped out plug number four with an old tr55 and it runs okay now.

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked

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Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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PostPosted: Tue Dec 08, 2015 9:14 am 
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Well to put this story to rest I found out it was the catalytic converter. Plug 4 was indeed loose but it didn't really change things that much when I tightened it up. I had been getting the P 404 in the p420 code as I said before. It seemed intermittent and I couldn't find the misfire. I figured I should just go ahead and replace the catalytic converter. That did it new catalytic converters been on for 10 days and there is no more code and no more miss.
Thx

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2001 Bonneville SSEi. 1598xx mi.
great car. Wrecked

ImageImage
Burnt Bonny.

Note if you pull the injectors to obserbe fuel delivery...make sure you leave the plugs in and disconnect the ign. Believe me


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PostPosted: Tue Dec 08, 2015 1:43 pm 
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Glad you've gotten everything sorted out now.

Thanks for posting the solution to the problem.
We never know how many people we may help--as plenty of non-forum members also read posts and are helped by the info.

A converter will go bad as a result of the engine burning oil, internal engine coolant leaks (LIM gaskets, for example) or incomplete combustion due to ignition issues.

What ever resolved the troubles you were having back when you had posted this?
http://www.pontiacbonnevilleclub.com/forum/2000-2005-other-than-gxp/topic46175.html?hilit=plug


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