D24TIC - won't go above 70mph

jaydbass · Sep 16th, 2011, 19:38

MOT yesterday - new shoes for handbrake and a new back box as previous one had a crack all the way round. Car fine - inevitable steering judder settled down nicely. However, on a Glasgow to Edinburgh run just now - on cruise control at 62mph/100kph - the car refused to top 70mph when I was overtaking. Switched off cruise control and same. Very slow to accelerate from 60 to 70 and would go no faster. Hoping it was some daft glitch with the cruise control and when I fire the Beastie up for the trip home all will be well....any suggestions?

Digidick · Sep 16th, 2011, 23:07

Our Passat had an issue a bit like yours and it needed a new MAF. Also wouldn't rev above 4k.

jor · Sep 18th, 2011, 13:16

The manual lists the following for low output, top speed: Injction pump - faulty, sucking air via fuel line or shaft seal, fuel line blocked, incorrect timing, throttle linkage incorrect, defective injector, valve clearances incorrect, blocked exhaust,air filter or fuel filter (water). Tests for the above are in the manual at k-jet.org. craig 8661 had the pump drive shaft seal problem.
You could start with the things which are simple and guaranteed not to make any difference, such as removing water from the fuel filter, or replacing it if it has not been changed in awhile and having a look at the air filter to see how bad a state it is in. The other relatively simple thing is to test the seal, done by gravity feeding the pump.
After that it would be on to timing (if pre 93), testing injectors etc.

jor

jaydbass · Oct 6th, 2011, 22:57

Thanks guys. Bizarrely enough, the problem disappeared instantly when i filled the tank with diesel and hasn't returned....

Palmer · Oct 8th, 2011, 12:41

Quote:

Originally Posted by jaydbass

Thanks guys. Bizarrely enough, the problem disappeared instantly when i filled the tank with diesel and hasn't returned....

Supermarket fuel ^^?

Sep 16th, 2011, 19:38	#1
jaydbass recent volvo owner Last Online: May 31st, 2013 14:15 Join Date: Jul 2007 Location: Erskine View Photos By: jaydbass	won't go above 70mph MOT yesterday - new shoes for handbrake and a new back box as previous one had a crack all the way round. Car fine - inevitable steering judder settled down nicely. However, on a Glasgow to Edinburgh run just now - on cruise control at 62mph/100kph - the car refused to top 70mph when I was overtaking. Switched off cruise control and same. Very slow to accelerate from 60 to 70 and would go no faster. Hoping it was some daft glitch with the cruise control and when I fire the Beastie up for the trip home all will be well....any suggestions? __________________ N-reg 940 turbodiesel estate (classic) - "Big Beastie" (now deceased) M-reg 940 estate (SE) LPG/Petrol (awaiting scrappage) 1998 S70 CD 2.5 auto LPG/petrol

Sep 18th, 2011, 13:16	#3
jor VOC 20573 Last Online: Jul 10th, 2023 22:14 Join Date: Mar 2007 Location: wembley	The manual lists the following for low output, top speed: Injction pump - faulty, sucking air via fuel line or shaft seal, fuel line blocked, incorrect timing, throttle linkage incorrect, defective injector, valve clearances incorrect, blocked exhaust,air filter or fuel filter (water). Tests for the above are in the manual at k-jet.org. craig 8661 had the pump drive shaft seal problem. You could start with the things which are simple and guaranteed not to make any difference, such as removing water from the fuel filter, or replacing it if it has not been changed in awhile and having a look at the air filter to see how bad a state it is in. The other relatively simple thing is to test the seal, done by gravity feeding the pump. After that it would be on to timing (if pre 93), testing injectors etc. jor __________________ Volvo 940 SE 1994 D24Tic. BMW C1 85 mpg Last edited by jor; Sep 18th, 2011 at 14:45.

Oct 6th, 2011, 22:57	#4
jaydbass recent volvo owner Last Online: May 31st, 2013 14:15 Join Date: Jul 2007 Location: Erskine View Photos By: jaydbass	Thanks guys. Bizarrely enough, the problem disappeared instantly when i filled the tank with diesel and hasn't returned.... __________________ N-reg 940 turbodiesel estate (classic) - "Big Beastie" (now deceased) M-reg 940 estate (SE) LPG/Petrol (awaiting scrappage) 1998 S70 CD 2.5 auto LPG/petrol

Sep 16th, 2011, 23:07	#2
Digidick Senior Member Last Online: Aug 3rd, 2016 22:19 Join Date: Mar 2011 Location: Duffield, Derby	Our Passat had an issue a bit like yours and it needed a new MAF. Also wouldn't rev above 4k.

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