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engine dies when AC is on #4529697
09/29/17 06:50 PM
09/29/17 06:50 PM
Joined: Oct 2010
Posts: 138
TN
terry274 Offline OP
terry274  Offline OP
Joined: Oct 2010
Posts: 138
TN
My truck is a 1996 F150 with a 302 and automatic transmission, 133,000 miles. Plugs, wires, distributer cap and rotor are all new Motorcraft items. Ignition timing is set at 12 degrees advanced. (The problem was there before the timing was advanced) The fuel filter has been changed.

The truck runs very well with one exception. If I start it with the AC on, it will normally die or run very rough. With the AC off it is fine. The problem seems worse when it is at operating temperature.

Why is it doing this?


1996 Ford F150
2011 Toyota Avalon
2012 Honda Accord
2009 Ford Taurus
Re: engine dies when AC is on [Re: terry274] #4529701
09/29/17 06:58 PM
09/29/17 06:58 PM
Joined: Oct 2011
Posts: 5,091
USA
NHGUY Offline
NHGUY  Offline
Joined: Oct 2011
Posts: 5,091
USA
Maybe the AC compressor is starting to lock up....

Re: engine dies when AC is on [Re: terry274] #4529705
09/29/17 07:01 PM
09/29/17 07:01 PM
Joined: Apr 2008
Posts: 37,092
Ontario, Canada
OVERKILL Online content
OVERKILL  Online Content
Joined: Apr 2008
Posts: 37,092
Ontario, Canada
Could be the IAC (Idle Air Control) valve, as they were prone to blocking up with carbon on the 302.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: engine dies when AC is on [Re: OVERKILL] #4529779
09/29/17 08:02 PM
09/29/17 08:02 PM
Joined: May 2016
Posts: 717
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline
Joined: May 2016
Posts: 717
Canada
Originally Posted By: OVERKILL
Could be the IAC (Idle Air Control) valve, as they were prone to blocking up with carbon on the 302.



Yeah, if the idle mixture is too lean, it can stumble and die with a load like that. See if it happens when put a little pressure
on the gas peddle, once you open the throttle plate a bit, different air induction circuits overtake an IAC problem! Then the IAC is your 80% problem!

Re: engine dies when AC is on [Re: terry274] #4529816
09/29/17 08:43 PM
09/29/17 08:43 PM
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 923
SF BAY AREA, CA
iac valve very common try one from junkyard off wrecked truck preferably so you can be pretty sure it was working


2007 Crown Vic P71 4.6 ~126K Miles, Royal Purple HPS 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~84K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.
Re: engine dies when AC is on [Re: terry274] #4529828
09/29/17 08:55 PM
09/29/17 08:55 PM
Joined: Apr 2006
Posts: 9,272
Birmingham, AL
01rangerxl Offline
01rangerxl  Offline
Joined: Apr 2006
Posts: 9,272
Birmingham, AL
A/c compressor should probably have delayed engagement when starting, but I'm not sure on that truck. My 1994 Ranger delays the compressor until a couple seconds after it's started. Does your truck do this? If not, maybe look into that.


2002 Ford Ranger XLT | 3.0 V6 / 5-Speed Automatic / 2WD | 216K miles
1994 Ford Ranger STX | 4.0 V6 / 5-Speed Manual / 4X4 | 199K miles
Re: engine dies when AC is on [Re: terry274] #4529866
09/29/17 09:52 PM
09/29/17 09:52 PM
Joined: Apr 2016
Posts: 835
KS
FordBroncoVWJeta Offline
FordBroncoVWJeta  Offline
Joined: Apr 2016
Posts: 835
KS
My 94 bronco did that when at a stop. Next thing I did I went down the highway and turned the AC full blast. Never did it again.


17 Volkswagen Jetta 1.4T
15 Honda CRV 2.4
12 Volkswagen Jetta 2.0
01 Pontiac Sunfire 2.2
Re: engine dies when AC is on [Re: 01rangerxl] #4529943
09/29/17 11:59 PM
09/29/17 11:59 PM
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Originally Posted By: 01rangerxl
A/c compressor should probably have delayed engagement when starting, but I'm not sure on that truck.
his does not have that. Turning on the ac powers the compressor up immediatly.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: engine dies when AC is on [Re: terry274] #4529951
09/30/17 12:14 AM
09/30/17 12:14 AM
Joined: Sep 2005
Posts: 5,663
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,663
MIchigan
Weak Alternator

Re: engine dies when AC is on [Re: terry274] #4530079
09/30/17 09:27 AM
09/30/17 09:27 AM
Joined: Aug 2003
Posts: 10,774
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 10,774
Buffalo, NY
So the stalling with the A/C turned on is only at idle RPM? Like said, possible IAC valve issue. I've seen A/C compressors lock up all at once and it will smoke the belt and can stall the engine.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)

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