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22-08-2012, 01:25 PM
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FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 582
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A few days ago on the freeway I was cruising at about 80km/hr, put my foot down a fair bit to get into a better position to change lanes, but nothing happened... no change in engine RPM, no trans kickdown. As I released the accel back to the position I had it in, the trans made a clunk as if it had started changing, but aborted when it realised I'd gone back to cruise speed.
Possibly related, the next day I was again already at road speed, behind a slower car, which then cleared, so I put the foot down... this time it did accelerate, but it was a bit sluggish, and I could feel the car wavering, like there was a fat guy rocking back and forth in the seat. Have not experienced any issues like a misfire or anything noticeable when accelerating normally from standstill, it's just when cruising and I give it extra juice. Didn't see any leadup to this behaviour, first time was sudden as mentioned above. No probs yesterday. Any ideas? |
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22-08-2012, 01:35 PM
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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usual questions
how long since you replaced plugs, air filter, fuel filter, did and ISC clean, did a battery reset?
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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22-08-2012, 02:14 PM
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Rob
Join Date: Jan 2010
Location: VN Capital
Posts: 1,584
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sounds like a spark issue, IE what Mr Hardware said. My bet would be plugs and leads.
__________________
99 liquid silver AU Classic -Sold
Supercharged Nissan 350z 280rwkw Blueprint series 3 AU V8 manual |
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22-08-2012, 05:42 PM
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FF.Com.Au Hardcore
Join Date: Dec 2009
Posts: 905
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Gearbox slipping if it's not a misfire maybe .
__________________
1998 AU VCT Ghia - Stock as a rock - Wifes car 1991 Toyota Soarer TT - 11.72 @ 116.7mph 2004 Ford Escape XLT V6 - Family Ride . |
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22-08-2012, 06:51 PM
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Falcon Unbelievable!
Join Date: Jul 2005
Location: Uncle Henry's Garage
Posts: 382
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How old is the coil pack?
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23-08-2012, 02:48 PM
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FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 582
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Coil pack, leads and sparks were replaced about a year/20,000km ago. Air filter would have been done around the same time.
Not sure about the fuel filter, would be at least a couple of years since it has been serviced at a dealer, and I haven't changed it myself since. I'm going to attack the intake with some carby cleaner today then do an ECU reset and see what happens, but to make things more difficult, the issue hasn't happened again, apart from those 2 (separate) times. Hope it's not the trans, I'm up to 207,000km, so it would be almost geriatric by now... |
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23-08-2012, 03:03 PM
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#7 | ||
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Auto Nerd
Join Date: Feb 2012
Location: Sydney
Posts: 808
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Worth having a look at the TPS output and seeing if there are any flatspots. Pretty quick check - just need a multimeter and a pin.
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23-08-2012, 04:50 PM
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FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 582
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Quote:
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23-08-2012, 07:27 PM
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#9 | |||
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Falcon Unbelievable!
Join Date: Jul 2005
Location: Uncle Henry's Garage
Posts: 382
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Quote:
Sounds like good plan of attack |
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23-08-2012, 07:53 PM
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#10 | |||
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Auto Nerd
Join Date: Feb 2012
Location: Sydney
Posts: 808
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Quote:
I guess with the butterfly open, you would let more air into the intake. Given the map sensor is in the intake, it would register and it would raise the rpm. Suppose if the TPS was not corresponding to this action, things like the injector pulse, gear selection would not necessarily be able to react to your commands. Let us know how it goes. Good luck. |
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21-10-2020, 05:42 PM
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Starter Motor
Join Date: Sep 2020
Posts: 2
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Hi guys
Had a surging and stalling problem. After new coils plugs etc and heartache I found the problem. There a small L shaped hose going from the air intake to the rocker cover, for cooling of the upper motor I think. The hotter the motor the more the hose sucks out of the air intake . This causes the various sensors to play up. I diverted the little hose away from the air intake and blocked the hole . The rocker cover was then sucking air in from the engine bay. PROBLEM FIXED |
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Hesitation/mild surging when applying throttle at cruise speed
Linear Mode
