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#864632 - 04/02/11 07:11 PM Rough Idle at at low idle
WestCoastMonteSS Offline
Member

Registered: 03/26/09
Posts: 414
Loc: Los Angeles, CA
Hi Guys, got a 86 SS Monte Carlo 305 and the car idles fine or decent when in park, but when you put it in drive it gets a really rough idle, and when you step on the gas it hesitates and slowly goes barely without dying, when the rpm passes 1 then it takes off. Carb has been rebuilt by previous owner, new egr valve, looks like new cables, plugs distributor cap. ANy help, maybe a module or something in the distributor? I am at a loss.
_________________________
1960 Chevy Impala 2 door
1964 CHevy Impala
1963 Chevy Impala ragtop
1959 2 door Chevy impala drool
1998 Chevy Silverado 1500 (DD)

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#864636 - 04/02/11 07:26 PM Re: Rough Idle at at low idle [Re: WestCoastMonteSS]
cj84ss Offline
10+ Year
Member

Registered: 11/02/03
Posts: 3358
Loc: Jacksonville, Fl.
Check the choke out. Where is it idleng at in park? RPM? When in gear and the brakes applied it should idleing at 650-700. Sounds like the timing may be off a little also?
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1984 SS, w/87 Grand National 2004R, 355 vortec, CCC, Crane XE262.
1969 Road Runner
2003 GMC Serria

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#864639 - 04/02/11 07:30 PM Re: Rough Idle at at low idle [Re: cj84ss]
WestCoastMonteSS Offline
Member

Registered: 03/26/09
Posts: 414
Loc: Los Angeles, CA
In park it sits at 1.5 rpm, (a little high i think), and yes in drive it idles at around 700. When stopped at a light, it idles rough and when you step on the gas the engine wants to die and then if you can baby it up to 1 rpm then it takes off. I was thinking the timing too, but havnt had a chance to get that checked out. It seems like the engine is choking when taking off from a stop but the carb has been rebuilt and i took it my dependable carb guy today and he said the carb is not the issue.


Edited by WestCoastMonteSS (04/02/11 07:31 PM)
_________________________
1960 Chevy Impala 2 door
1964 CHevy Impala
1963 Chevy Impala ragtop
1959 2 door Chevy impala drool
1998 Chevy Silverado 1500 (DD)

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#864644 - 04/02/11 07:37 PM Re: Rough Idle at at low idle [Re: WestCoastMonteSS]
BuzzLOL Offline
Member

Registered: 05/02/06
Posts: 5577
Loc: Toledo, Ohio
.. Has it ever run properly since you owned it?
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'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O

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#864653 - 04/02/11 08:13 PM Re: Rough Idle at at low idle [Re: BuzzLOL]
WestCoastMonteSS Offline
Member

Registered: 03/26/09
Posts: 414
Loc: Los Angeles, CA
No i bought it like this.
_________________________
1960 Chevy Impala 2 door
1964 CHevy Impala
1963 Chevy Impala ragtop
1959 2 door Chevy impala drool
1998 Chevy Silverado 1500 (DD)

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#864747 - 04/03/11 12:56 AM Re: Rough Idle at at low idle [Re: WestCoastMonteSS]
Buick Runner Offline
Member

Registered: 05/06/07
Posts: 3996
Loc: Dharma station 1 the Hydra
Sounds like the rebuilder didn't clean the idle tubes. What's the M/C dwell at idle?
_________________________
SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

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

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#865000 - 04/04/11 01:31 PM Re: Rough Idle at at low idle [Re: Buick Runner]
WestCoastMonteSS Offline
Member

Registered: 03/26/09
Posts: 414
Loc: Los Angeles, CA
In Park at around 1.5 in drive around .600.
_________________________
1960 Chevy Impala 2 door
1964 CHevy Impala
1963 Chevy Impala ragtop
1959 2 door Chevy impala drool
1998 Chevy Silverado 1500 (DD)

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#865004 - 04/04/11 02:03 PM Re: Rough Idle at at low idle [Re: WestCoastMonteSS]
86ttop Offline
10+ Year
Member

Registered: 12/23/99
Posts: 10197
Loc: Colonial Beach, Va
that looks like the TPS, the M/C dwell should be around 30 degrees and wavering when at idle and up to operating temp, on the 6 cyl scale on the meter.
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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

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#865088 - 04/04/11 09:52 PM Re: Rough Idle at at low idle [Re: 86ttop]
Buick Runner Offline
Member

Registered: 05/06/07
Posts: 3996
Loc: Dharma station 1 the Hydra
It would be a good idea to check the TPS output though the complete throttle range with a voltmeter. Worse comes to worse you could head to Sean Murphy Induction in Huntington Beach
CA. He seems to be quite the expert with CCC carbs.
_________________________
SBC powered 1987 Regal with TES headers, ZZ4 intake, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

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

Top
#865252 - 04/05/11 06:44 PM Re: Rough Idle at at low idle [Re: Buick Runner]
WestCoastMonteSS Offline
Member

Registered: 03/26/09
Posts: 414
Loc: Los Angeles, CA
thanks for the hrelp everyone, turned out to be the distributor and all the ignition modules etc in the ditributor underneath the rotor, had a rebuilt one replaced for $250 at a shop. Car runs like new now.
THanks everyone MCSS rocks
_________________________
1960 Chevy Impala 2 door
1964 CHevy Impala
1963 Chevy Impala ragtop
1959 2 door Chevy impala drool
1998 Chevy Silverado 1500 (DD)

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#865446 - 04/06/11 05:11 PM Re: Rough Idle at at low idle [Re: WestCoastMonteSS]
basemonte Offline
10+ Year
Member

Registered: 01/31/02
Posts: 1208
Loc: Old Bridge, NJ
I've always had ign modules totally fail, (no start). Never had one kind of fail where it affected performance.

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