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#1056386 - 03/14/18 02:16 AM Rough Idle When pollution pump kicks on ?  
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juangomez22 Offline
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houston tx
1988 Monte carlo SS everything is stock. I believe that i might have carb issues as well. So when i start the car and i let it idle and it will idle ok . but when the pollution pump kicks on ? (make a noise) like if it is working the car starts to idle rough and dies and then has a hard time starting back. Any idea what might be causing the rough idle when pollution pump kick on ? What rpm should a stock ss be sitting at when fully warmed up with A/C off ? Does anyone have a link on how to check timing on the ss also. I would like to check all these things out as well. Just purchased this SS with 35k on it. They said it was all original ? I have my doubts ?

Last edited by juangomez22; 03/14/18 02:16 AM.
#1056388 - 03/14/18 02:50 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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Buick Runner Online content
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Dharma station 1 the Hydra
Do you mean the AIR pump? Its always pumping but the computer diverts air to different places as needed. If its making noise it is likely bad. The curb idle speed in drive is 600 rpm, it will be higher and inaccurate in park.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1056389 - 03/14/18 03:31 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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juangomez22 Offline
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houston tx
Thank you for your reply. Yes when the air pump makes noise the idle gets rough enough that the car will die. What should the rpm in park be with AC off ? I would also like to know where i can purchase a complete rebuild kit for the carburetor ?

#1056390 - 03/14/18 11:09 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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Richie Cat Offline
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Originally Posted by juangomez22
I would also like to know where i can purchase a complete rebuild kit for the carburetor ?

It's best to send the carb to a company that rebuilds it properly.
Any good auto repair manual will give you the specs your looking for, along with how to check/correct timing and give you information how the air pump system works.
Go to your public library, there are repair manuals there.


83 SC, 355 w/TPI
#1056392 - 03/14/18 01:38 PM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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DLV555 Offline
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Findlay, OH USA
The smog pump doesn't "kick on" and has no effect on the idle either way. If the pump itself is tied up it would lug the motor down. As far as where to get a rebuild kit, any auto parts store can get you a rebuild kit. Quadrajets are picky carbs so if you aren't ready to take the time to learn them, it may be best to outsource the rebuild. They really aren't THAT bad, though. A better, more complete kit can be had from Q-Jet specialty shops like Cliff's High Performance.


'87 Monte Carlo SS, 400 SBC, 800 Q-Jet, Edelbrock RPM Q-Jet intake, Howards BM Rattler cam, Flowtech headers, 200-4R w/shift kit, 4.10 posi, 2.5" exhaust, DeltaFlow 40s
'73 Mercury Montego, 460 BBF, AirGap Intake, 800 Q-Jet, Voodoo cam, C6, 9" 3.25 posi, 3" exh, Flowmaster 40s
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#1056394 - 03/14/18 02:25 PM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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upflying Offline
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Reno, NV
The only device that "kicks on" on the engine accessory drive is the air conditioning compressor. The AC clutch on the compressor will click as it cycles on and off. Idle will drop as the clutch engages. There is an electric plunger type device on the carburetor linkage that increases idle when the clutch engages. Low speed steering lock to lock will also turn off the air conditioning compressor.
The originality of your car can be researched on the opening page of MCSS.com. What causes doubt your car isn't original?


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1056396 - 03/14/18 02:57 PM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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Witness86SS Offline
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Hatfield, PA
I'm far from an expert but have you considered ECM, Sensor or electric choke issues?
It sounds like you start and run fine as the car warms up but then fail once it hits closed loop on the ECM. Or maybe it's a choke/temp issue. I'm a little fuzzy on how choke works. I just know when it is wrong it will bog the engine down.

Trying to start with it warmed up will just make your issue happen immediately.


Justin
1986 Black SS
Upgrades: 350 L05 - Hooker Longtubes - FlowMaster True Dual 2.5" - Electric Cutouts - Electric Fans - Transcooler - Proforged Steering Kit - Astro Shaft - AR62 OUTLAW II Wheels - Energy Suspension Bushings - Bitflipper Chip - 87 ECM - Moog Springs and Ball Joints - Bilstein Shocks - Bucket Seats
#1056400 - 03/14/18 07:19 PM Re: Rough Idle When pollution pump kicks on ? [Re: upflying]  
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Richie Cat Offline
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Originally Posted by upflying
There is an electric plunger type device on the carburetor linkage that increases idle when the clutch engages.


It's called an idle speed solenoid.
Any quality manual will explain this part and function.


83 SC, 355 w/TPI
#1056401 - 03/14/18 07:23 PM Re: Rough Idle When pollution pump kicks on ? [Re: Richie Cat]  
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upflying Offline
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Reno, NV
Originally Posted by Richie Cat
Originally Posted by upflying
There is an electric plunger type device on the carburetor linkage that increases idle when the clutch engages.


It's called an idle speed solenoid.
Any quality manual will explain this part and function.

Yea, I knew the name, I was just dialing down the tech lingo a bit for the OP.


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1056409 - 03/15/18 02:22 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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86ttop Offline
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For E4ME repair/rebuild, I use www.customrebuiltcarbs.com Give Phil a call and he will fix you up, I used him for two carbs and they were basically bolt on and go. Give him a try, quick turnaround too.!!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1056410 - 03/15/18 02:50 AM Re: Rough Idle When pollution pump kicks on ? [Re: 86ttop]  
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juangomez22 Offline
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houston tx
Thank you everyone for your responses. I know the noise is coming from the air pump. I turn a/c off and I can hear a noise in the air pump area and engine will struggle to idle. once this noise is gone the engine idles ok. I know i have a spare one laying around somewhere in garage. I will try to swap it out and see what it does.
Originally Posted by 86ttop
For E4ME repair/rebuild, I use www.customrebuiltcarbs.com Give Phil a call and he will fix you up, I used him for two carbs and they were basically bolt on and go. Give him a try, quick turnaround too.!!
How much did he charge you for the rebuild ?

#1056413 - 03/15/18 10:03 PM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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Buick Runner Online content
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Dharma station 1 the Hydra
Are you sure you are not confusing the smog pump with the A/C compressor? The smog pump does not kick on and off but the A/C compressor does kick on and off. The compressor is a high load even if it operates correctly.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1056414 - 03/15/18 10:27 PM Re: Rough Idle When pollution pump kicks on ? [Re: Buick Runner]  
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Richie Cat Offline
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Originally Posted by Buick Runner
Are you sure you are not confusing the smog pump with the A/C compressor? The smog pump does not kick on and off but the A/C compressor does kick on and off. The compressor is a high load even if it operates correctly.


Correct me if I'm wrong. Yes the pump continues to pump air. But doesn't it devert air when you decelerate? So it might "look" like it shuts off? Also his pump is making noise which a problem any how.


83 SC, 355 w/TPI
#1056416 - 03/16/18 12:29 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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ChasUno Offline
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Bradenton, FL
The clicking noise could be a number of things. It's possible that there is a problem/ leak among the AIR pump piping or vacuum hoses. Maybe the diverter valve is faulty, and when it's switching on it's actually allowing exhaust gases to exit via the AIR system rather than pumping air into the headers. That may affect backflow causing the poor idling you describe.

Also check the one way pressed steel valves connected to the AIR injection header tubes. They should stop backflow of exhaust gases from the AIR injection pipes back into the AIR pump.

I also know that with one of the AIR pump pipes disconnected and with the engine running, you will hear a noticeable clicking sound.

If you can, take a clear picture of your engine compartment and post it on here so that we can see what you have installed and where, and whether anything looks obviously amiss.


1986 Monte Carlo SS

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#1056418 - 03/16/18 01:30 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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juangomez22 Offline
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houston tx
Thanks guys. I am for sure its not the A/C compressor.. I just purchased this MC for my kids since i have had no time to finish my restoration etc.. Kinda a graduation present.. I know for sure its coming from the air pump.. I will remove it when i get a chance and inspect it..

#1056420 - 03/16/18 01:49 AM Re: Rough Idle When pollution pump kicks on ? [Re: juangomez22]  
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86ttop Offline
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86ttop  Offline
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Brooksville, Fl
Originally Posted by juangomez22
Thank you everyone for your responses. I know the noise is coming from the air pump. I turn a/c off and I can hear a noise in the air pump area and engine will struggle to idle. once this noise is gone the engine idles ok. I know i have a spare one laying around somewhere in garage. I will try to swap it out and see what it does.
Originally Posted by 86ttop
For E4ME repair/rebuild, I use www.customrebuiltcarbs.com Give Phil a call and he will fix you up, I used him for two carbs and they were basically bolt on and go. Give him a try, quick turnaround too.!!
How much did he charge you for the rebuild ?



Click on my link and give him a call!!


Leo Paugh
It's not an attitude, it's just the way I am.
POW*MIA
You are not forgotten
If things improve with age, I must be approaching magnificent. thumbs
#1056422 - 03/16/18 03:31 AM Re: Rough Idle When pollution pump kicks on ? [Re: Richie Cat]  
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Buick Runner Online content
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Dharma station 1 the Hydra
Originally Posted by Richie Cat
Originally Posted by Buick Runner
Are you sure you are not confusing the smog pump with the A/C compressor? The smog pump does not kick on and off but the A/C compressor does kick on and off. The compressor is a high load even if it operates correctly.


Correct me if I'm wrong. Yes the pump continues to pump air. But doesn't it devert air when you decelerate? So it might "look" like it shuts off? Also his pump is making noise which a problem any how.


Yep, it diverts air to the aircleaner when you decelerate. Also it only pumps air into the exhaust manifolds when the engine is cold. Once fully warmed it diverts air directly to the cat converter when cruising or aircleaner when decelerating. Either way it is always spinning and doesn't have a clutch to disengage and freewheel like the A/C compressor.

On a stock setup, the AIR pump is located down low on the passenger side with the alternator mounted above it.

Last edited by Buick Runner; 03/16/18 03:38 AM.

SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.

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