03-31-2014, 10:01 PM
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#1
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GX Member
Join Date: Jul 2012
Location: Denver
Posts: 21
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Stalling and Limited RPM
So just over the past few weeks my 2.4L has started to bog pretty bad at traffic stops to the point where if I don't put it into neutral it dies. You can only imagine how frustrating a recent 30-point turn was the other day. when I'm moving it seems to run pretty smooth. Did find a vacuum leak on the TBI, fixed it. Latest finding is that in park or neutral it will only rev to 4100-4200rpm and then sound like a rev limiter. When running through the gears, pedal down, it will run into the 6000rpm range no problem.
Suggestions? I'm already thinking motor mounts maybe?
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03-31-2014, 10:11 PM
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#2
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Its Beer Thirty
Join Date: Nov 2005
Location: Goodyear, AZ
Posts: 1,259
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In park and neutral it won't go over 4200, safety so you don't pop your motor.
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Originally Posted by Daytona
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03-31-2014, 10:14 PM
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#3
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GL Member
Join Date: Jul 2011
Location: Montgomery,Al
Posts: 308
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4k is the rev limiter.
First how many miles and what codes does it have.
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Quote:
Originally Posted by xXManwhoreXx
I could never actually get rid of the alero as much as I hate it some times
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Baby Sandy: 2001 2.4 Grand Am se 1.5 (auto) 32k-119k : Sept.2002-Aug.2010
Mickey: 2001 Alero GL 2.4 5-speed (Nov. 2010) 109k-???
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03-31-2014, 10:17 PM
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#4
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Quote:
Originally Posted by Badaxe
Latest finding is that in park or neutral it will only rev to 4100-4200rpm and then sound like a rev limiter. When running through the gears, pedal down, it will run into the 6000rpm range no problem.
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The tune is set to fuel/spark cut around 4000RPM in P/N and 6250ish in D.
Quote:
Originally Posted by Badaxe
Suggestions? I'm already thinking motor mounts maybe?
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Has nothing to do with it.
Pretty sure you have a good sized vacuum leak. Either at the intake manifold gasket, throttle body gasket, or one of the hoses.
Surely you checked the spark plugs, air filter, stupid stuff already.
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03-31-2014, 10:43 PM
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#5
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GX Member
Join Date: Jul 2012
Location: Denver
Posts: 21
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Plugs have less than 6K on em' and engine is at 145K. Good to know the rpms are doing what they are supposed to. Came up with the motor mount "approach" from other posts here.
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03-31-2014, 11:48 PM
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#6
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GLS member
Join Date: Feb 2011
Location: Kansas
Posts: 2,116
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Map hose? Exact symptoms of my friends when it was acting up from that
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04-01-2014, 03:30 AM
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#7
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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ICM.
Spend the money and get an ACDelco one
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33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12
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04-01-2014, 04:28 AM
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#8
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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Or maybe an IAC?
icm on that motor I believe is connected with the IDI Cover. Its a decently expensive fix
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Meet Destiny, shes a 2001 Oldsmobile Alero GLS, F40 6MT swap. (#2 of 3)
2/24/14 - 200,000 miles body/motor. 22,300 on F40.
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04-01-2014, 08:03 AM
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#9
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GLS member
Join Date: Feb 2011
Location: Kansas
Posts: 2,116
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I would start cheap with the suggestions and work your way up the list
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04-01-2014, 09:06 AM
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#10
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,876
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Quote:
Originally Posted by Redog
ICM.
Spend the money and get an ACDelco one
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If it was an ignition module problem it shouldn't go away at high RPM, it'd get worse.
Vacuum leaks tend to cause issues at low throttle far more than higher. IAC, TPS could also be of concern, but vacuum leak is more likely than anything else by far.
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04-01-2014, 09:01 PM
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#11
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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It's just that the issues he mentioned reminded me so much of the problems I had.
There is no vacuum present at WOT either. So yeah look there first
__________________
33% ALEROMOD OWNER!!
2000 Olds Alero 3400 SFI 14.53 @ 94.93
1985 Olds Delta 88 307 SBO 17.96 @ 76.99
2007 Volvo V50 T5 6M 15.782 @ 89.12
www.facebook.com/kb0177
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04-01-2014, 10:30 PM
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#12
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GX Member
Join Date: Jul 2012
Location: Denver
Posts: 21
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Thanks for the advice y'all. I won't be able to touch it until tomorrow afternoon so I'll let you know what I find.
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