740 breakdown

radiomark · Jul 13th, 2009, 17:19

I had to call the RAC out this morning when the 740 suddenly died on me and I couldn't restart it.The RAC guy cranked the engine and saw that the tacho didnt move so he pulled a connector at the back of the dizzy cap and after checking the pins with a meter and getting a spark from the coil when he put some power to the lead said I needed a new distributer.got towed home

just went out to the car and it started first time.
does this seem like a fair diagnosis or looking at the FAQ is the rpm sensor a likely cause.

car is an 88 740 b200E

James_N · Jul 14th, 2009, 01:25

This was what happened to us in france...car died...wouldnt restart...no techo movement on cranking, turned out to be ignition amplifier! £40 for a bosch one from a motor factors

NI_Volvo_Nut · Jul 14th, 2009, 06:27

I could be wrong, but I think the B200E doesnt have a TDC sensor, I'd go with the Ign Moduel as said above, but sounds to me like fuel pump or relay, is there a spark when cranking?

radiomark · Jul 14th, 2009, 08:23

no spark when cranking.rac guy managed to get spark when he put power into the lead he pulled off the dizzy ,which led him to think the connection in the dizzy was faulty .fitted new relay recently .car will cold start,but die after or during hot start.

nickm · Jul 14th, 2009, 09:23

Power stage/ignition amplifier or hall senor are places to look.
The FAQ cover them. Only thing that has stopped mine.
Nick

RealEstate · Jul 14th, 2009, 10:08

It sounds as if your problem is ignition rather than fuel. However, it might be worth checking the fuel relay socket pins. One of these became worn / loose on my 940 causing an intermittent connection with the relay when the car had warmed up. The result was classic fuel relay symptoms - engine dying/stumbling, that persist even when you swap the fuel relay for another.
A loose pin may not be immediately obvious because if other pins have good grip, the relay feels secure. However, wiggling the relay with one's finger with the engine running & warm may stimulate the fault. Then you can check each connector spade with a single spade to find the loose one.
All the best,
Ben

BillB · Jul 14th, 2009, 12:49

If the tach is dead AND you have no spark it is almost certainly the hall sensor (which is either in the dist. or is an RPM sensor. It is NOT the fuel pump relay - this does NOT inhibit the spark production. Can you hear fuel pump noise momentarily after cranking? If not change the sensor - it should be regarded as a maintenance item anyway after 150k. There's a possibility it could be the Ignition Control Unit but unlikely.

radiomark · Jul 14th, 2009, 13:41

thanks for all the advice.the car is starting first time at the moment as its sitting outside.if i drove it or let it warm up i suspect it would then not restart or cut out.ruled out relay as its new and wiring is ok.

looks like new distributer.cant see the sensor on the bell housing so think it must be integral

NI_Volvo_Nut · Jul 14th, 2009, 14:12

I may know where there is a distributor if you need one mate.

radiomark · Jul 15th, 2009, 08:45

yep,tell me more

need to get it reliable again

Jul 13th, 2009, 17:19	#1
radiomark Senior Member Last Online: Mar 6th, 2020 14:24 Join Date: Feb 2006 Location: eastbourneish View Photos By: radiomark	740 breakdown I had to call the RAC out this morning when the 740 suddenly died on me and I couldn't restart it.The RAC guy cranked the engine and saw that the tacho didnt move so he pulled a connector at the back of the dizzy cap and after checking the pins with a meter and getting a spark from the coil when he put some power to the lead said I needed a new distributer.got towed home just went out to the car and it started first time. does this seem like a fair diagnosis or looking at the FAQ is the rpm sensor a likely cause. car is an 88 740 b200E

Jul 14th, 2009, 01:25	#2
James_N VOC Member Last Online: May 20th, 2024 12:09 Join Date: Jan 2006 Location: Stafford View Photos By: James_N	This was what happened to us in france...car died...wouldnt restart...no techo movement on cranking, turned out to be ignition amplifier! £40 for a bosch one from a motor factors __________________ 1997 Volvo 940 LPT Celebration. 187,700 miles, manual.

Jul 14th, 2009, 06:27	#3
NI_Volvo_Nut Volvologist Last Online: Dec 6th, 2023 11:13 Join Date: Aug 2008 Location: Bangor - Norn Iron View Photos By: NI_Volvo_Nut	I could be wrong, but I think the B200E doesnt have a TDC sensor, I'd go with the Ign Moduel as said above, but sounds to me like fuel pump or relay, is there a spark when cranking? __________________ What's the matter with the car I'm driving? Can't you tell that it's out of style? Should I get a set of white wall tires? Are you gonna cruise the miracle mile?

Jul 14th, 2009, 10:08	#6
RealEstate Master Member Last Online: Nov 4th, 2018 16:06 Join Date: Dec 2003 Location: Berkshire & N Wales View Photos By: RealEstate	Fuel Relay Socket It sounds as if your problem is ignition rather than fuel. However, it might be worth checking the fuel relay socket pins. One of these became worn / loose on my 940 causing an intermittent connection with the relay when the car had warmed up. The result was classic fuel relay symptoms - engine dying/stumbling, that persist even when you swap the fuel relay for another. A loose pin may not be immediately obvious because if other pins have good grip, the relay feels secure. However, wiggling the relay with one's finger with the engine running & warm may stimulate the fault. Then you can check each connector spade with a single spade to find the loose one. All the best, Ben Last edited by RealEstate; Jul 14th, 2009 at 10:10.

Jul 14th, 2009, 14:12	#9
NI_Volvo_Nut Volvologist Last Online: Dec 6th, 2023 11:13 Join Date: Aug 2008 Location: Bangor - Norn Iron View Photos By: NI_Volvo_Nut	I may know where there is a distributor if you need one mate. __________________ What's the matter with the car I'm driving? Can't you tell that it's out of style? Should I get a set of white wall tires? Are you gonna cruise the miracle mile?

Jul 14th, 2009, 08:23	#4
radiomark Senior Member Last Online: Mar 6th, 2020 14:24 Join Date: Feb 2006 Location: eastbourneish View Photos By: radiomark	no spark when cranking.rac guy managed to get spark when he put power into the lead he pulled off the dizzy ,which led him to think the connection in the dizzy was faulty .fitted new relay recently .car will cold start,but die after or during hot start.

Jul 14th, 2009, 09:23	#5
nickm Member Last Online: May 14th, 2024 14:48 Join Date: Oct 2008 Location: Sydney Australia	Power stage/ignition amplifier or hall senor are places to look. The FAQ cover them. Only thing that has stopped mine. Nick

Jul 14th, 2009, 12:49	#7
BillB VOC Member Last Online: Apr 24th, 2024 13:58 Join Date: Dec 2002 Location: Bristol	If the tach is dead AND you have no spark it is almost certainly the hall sensor (which is either in the dist. or is an RPM sensor. It is NOT the fuel pump relay - this does NOT inhibit the spark production. Can you hear fuel pump noise momentarily after cranking? If not change the sensor - it should be regarded as a maintenance item anyway after 150k. There's a possibility it could be the Ignition Control Unit but unlikely.

Jul 14th, 2009, 13:41	#8
radiomark Senior Member Last Online: Mar 6th, 2020 14:24 Join Date: Feb 2006 Location: eastbourneish View Photos By: radiomark	thanks for all the advice.the car is starting first time at the moment as its sitting outside.if i drove it or let it warm up i suspect it would then not restart or cut out.ruled out relay as its new and wiring is ok. looks like new distributer.cant see the sensor on the bell housing so think it must be integral

Jul 15th, 2009, 08:45	#10
radiomark Senior Member Last Online: Mar 6th, 2020 14:24 Join Date: Feb 2006 Location: eastbourneish View Photos By: radiomark	yep,tell me more need to get it reliable again

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)