newbie! - Page 3

rogerthechorister · Mar 6th, 2015, 09:04

Have you got the diagnostic box with a prod on the front suspension turret - or the not-really OBD2 socket in the cubby? Whichever, if you have a diagnostic box, pull the codes.

And you might as well do the radio suppression relay just to rule it out.

bob12 · Mar 6th, 2015, 18:47

Some 25 and more years ago the main dealer was Forum, Pibright (now after several ownership changes, Squire Furneaux). Forum had a branch in Farnham. When they sold out Pirbright to Inchcape (Lancaster) the Farnham branch went Indy as PGI.

More useless info!

Forrest · Mar 7th, 2015, 18:48

Has your car got the RPM sensor in the top of the bell housing? It can be hard to see. They are notorious for going faulty. The insulation in the signal cable breaks down with heat/age. You'd get fuel/spark as you craked the engine but when the ECU failed to sense the engine running it would cut the ignition.

Ian21401 · Mar 7th, 2015, 22:55

1) Crankshaft Position Sensor (aka RPM sensor) (VO271949) (£32.80 ex VAT)
located on top of bell housing.
2) Radio Noise Suppression Relay (fitted to suppress radio interference caused
by the fuel injectors) Actually earths the injectors. (VO1323592) (£29.80 ex
VAT) located on front offside inner wing.
3) Ignition Amplifier. (Bosch 0227 100124) (VO3501921) Not sure of price.
Located on front nearside inner wing behind air filter box.
4) Mass Air Flow Sensor (MAF) (Bosch 02802 12016) (VO8251497) About
£250.00 if you shop around. Believed to be about £350.00 rrp)
My '92 940 2.0L non turbo has done 190,000 miles. I've replaced items 1, 2 & 4 since acquiring the car in April 2005 with 102,000 miles on the odometer.
My defective MAF showed up on a code read. I managed to find a replacement at a breaker but it didn't last long so I bought a new one.

TonyS9 · Mar 8th, 2015, 16:28

The old fuel and fire approach usually works pretty well, so i guess you don't have one. How do you know you have fuel? Is it spurting out with a connector off, have you measured pressure?

The radio suppression relay provides power to the injectors, it should really be called injector relay. Its just up above the battery in mine but if you have 2 pumps you might not have one. Just bypass it to test or check for voltage at the injectors.

Rothers940 · Mar 10th, 2015, 02:03

Sorry for the late reply. Been pratting around with the car for the last few days. I have spark and fuel. I've tested the fuel from the rail using the little valve on it. I replaced the crank sensor today and still no luck. The thing that's really confused me is I had a Fi control unit fault code and 121, which I believe is MAF. But they have both gone without a reset. Spent nearly £200 on parts to fix the car and it still isn't running

cam · Mar 10th, 2015, 07:02

Hi mate and welcome

Rversteeg · Mar 10th, 2015, 08:43

In my 940 LPT the radio suppression relay is actually feeding the ignition coil instead of the injectors. According the wiring diagram this is also applicable to the 2 ltr engine models B200F and B200FT (don't know if you have this engine). The relay is used to power the coil directly from the battery instead of via the ignition key. This keeps the potentially "pulsating" current away as far as possible from the radio, to prevent interference. For testing you can safely bypass the relay, as long as you disconnect it afterwards to prevent the battery from draining.

Rothers940 · Mar 13th, 2015, 20:25

The mystery deepens. Ive got spark and air. But no fuel appears to be reaching the rail. I've checked the pumps and fuel filter and they are fine. What else can cause no fuel? Its got plenty of fuel in the tank and will run on brake cleaner. Can't figure out why it's not got anything in the rail

TonyS9 · Mar 14th, 2015, 02:52

Well that's the opposite to what you said earlier. You also said the pumps were priming, is that still the case?

Just keep undoing unions or checking power until you see fuel pumping out.
Could a pressure pump have failed?

Mar 6th, 2015, 09:04	#21
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Diagnostics? Have you got the diagnostic box with a prod on the front suspension turret - or the not-really OBD2 socket in the cubby? Whichever, if you have a diagnostic box, pull the codes. And you might as well do the radio suppression relay just to rule it out. __________________ B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold.

Mar 7th, 2015, 22:55	#24
Ian21401 Premier Member Last Online: Feb 11th, 2023 20:32 Join Date: May 2010 Location: Blyth, Northumberland	The usual suspect parts in my experience. 1) Crankshaft Position Sensor (aka RPM sensor) (VO271949) (£32.80 ex VAT) located on top of bell housing. 2) Radio Noise Suppression Relay (fitted to suppress radio interference caused by the fuel injectors) Actually earths the injectors. (VO1323592) (£29.80 ex VAT) located on front offside inner wing. 3) Ignition Amplifier. (Bosch 0227 100124) (VO3501921) Not sure of price. Located on front nearside inner wing behind air filter box. 4) Mass Air Flow Sensor (MAF) (Bosch 02802 12016) (VO8251497) About £250.00 if you shop around. Believed to be about £350.00 rrp) My '92 940 2.0L non turbo has done 190,000 miles. I've replaced items 1, 2 & 4 since acquiring the car in April 2005 with 102,000 miles on the odometer. My defective MAF showed up on a code read. I managed to find a replacement at a breaker but it didn't last long so I bought a new one.

Mar 10th, 2015, 08:43	#28
Rversteeg Master Member Last Online: May 24th, 2024 16:39 Join Date: Feb 2006 Location: Amersfoort (NL)	Radio suppression relay In my 940 LPT the radio suppression relay is actually feeding the ignition coil instead of the injectors. According the wiring diagram this is also applicable to the 2 ltr engine models B200F and B200FT (don't know if you have this engine). The relay is used to power the coil directly from the battery instead of via the ignition key. This keeps the potentially "pulsating" current away as far as possible from the radio, to prevent interference. For testing you can safely bypass the relay, as long as you disconnect it afterwards to prevent the battery from draining.

Mar 6th, 2015, 18:47	#22
bob12 bob12 Last Online: May 20th, 2024 19:27 Join Date: Aug 2006 Location: Woking	Some 25 and more years ago the main dealer was Forum, Pibright (now after several ownership changes, Squire Furneaux). Forum had a branch in Farnham. When they sold out Pirbright to Inchcape (Lancaster) the Farnham branch went Indy as PGI. More useless info!

Mar 7th, 2015, 18:48	#23
Forrest VOC Member Last Online: Today 12:47 Join Date: Feb 2008 Location: Gloucester	Has your car got the RPM sensor in the top of the bell housing? It can be hard to see. They are notorious for going faulty. The insulation in the signal cable breaks down with heat/age. You'd get fuel/spark as you craked the engine but when the ECU failed to sense the engine running it would cut the ignition.

Mar 8th, 2015, 16:28	#25
TonyS9 Premier Member Last Online: May 19th, 2024 20:22 Join Date: Jul 2009 Location: Holywood	The old fuel and fire approach usually works pretty well, so i guess you don't have one. How do you know you have fuel? Is it spurting out with a connector off, have you measured pressure? The radio suppression relay provides power to the injectors, it should really be called injector relay. Its just up above the battery in mine but if you have 2 pumps you might not have one. Just bypass it to test or check for voltage at the injectors.

Mar 10th, 2015, 02:03	#26
Rothers940 Junior Member Last Online: Jun 6th, 2018 17:47 Join Date: Nov 2013 Location: Sutton south London	Sorry for the late reply. Been pratting around with the car for the last few days. I have spark and fuel. I've tested the fuel from the rail using the little valve on it. I replaced the crank sensor today and still no luck. The thing that's really confused me is I had a Fi control unit fault code and 121, which I believe is MAF. But they have both gone without a reset. Spent nearly £200 on parts to fix the car and it still isn't running

Mar 10th, 2015, 07:02	#27
cam Premier Member Last Online: May 24th, 2024 08:08 Join Date: Dec 2008 Location: llanhari	Hi mate and welcome

Mar 13th, 2015, 20:25	#29
Rothers940 Junior Member Last Online: Jun 6th, 2018 17:47 Join Date: Nov 2013 Location: Sutton south London	The mystery deepens. Ive got spark and air. But no fuel appears to be reaching the rail. I've checked the pumps and fuel filter and they are fine. What else can cause no fuel? Its got plenty of fuel in the tank and will run on brake cleaner. Can't figure out why it's not got anything in the rail

Mar 14th, 2015, 02:52	#30
TonyS9 Premier Member Last Online: May 19th, 2024 20:22 Join Date: Jul 2009 Location: Holywood	Well that's the opposite to what you said earlier. You also said the pumps were priming, is that still the case? Just keep undoing unions or checking power until you see fuel pumping out. Could a pressure pump have failed?

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