And on the 4CU, it's main purpose was to power the fuel pump relay if either the engine was being cranked, or there was air flowing through the AFM.
So the fuel pump would automatically stop if the engine stalled.
Chris.
Search found 4839 matches
- Wed Apr 05, 2023 7:53 pm
- Forum: Electrical & Ignition Area
- Topic: Location of DAC1861 Diode Pack
- Replies: 15
- Views: 13143
- Mon Apr 03, 2023 8:22 pm
- Forum: Electrical & Ignition Area
- Topic: Location of DAC1861 Diode Pack
- Replies: 15
- Views: 13143
Re: Location of DAC1861 Diode Pack
The 'flapper' type EFI system had a diode pack, but that was never fitted to the 4.2 litre engine as far as I know.
It sits next to the main relay and fuel pump relays next to the ECU, which I think is under the drivers seat.
Chris.
It sits next to the main relay and fuel pump relays next to the ECU, which I think is under the drivers seat.
Chris.
- Sun Apr 02, 2023 4:23 pm
- Forum: Electrical & Ignition Area
- Topic: Location of DAC1861 Diode Pack
- Replies: 15
- Views: 13143
Re: Location of DAC1861 Diode Pack
I can't tell unfortunately. My copy of RAVE is 1995, and there is no mention of a diode pack in the fuel pump / inertia switch circuit.
Chris.
Chris.
- Sat Apr 01, 2023 7:35 pm
- Forum: Electrical & Ignition Area
- Topic: Location of DAC1861 Diode Pack
- Replies: 15
- Views: 13143
Re: Location of DAC1861 Diode Pack
Any idea what it's for. I've been looking at the Land Rover electrical manual which gives component locations, but there are a lot of diodes!
Chris.
Chris.
- Thu Mar 30, 2023 8:39 pm
- Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
- Topic: Too rich / too lean
- Replies: 42
- Views: 15942
Re: Too rich / too lean
Good news!
Chris.
Chris.
- Wed Mar 29, 2023 7:27 pm
- Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
- Topic: Too rich / too lean
- Replies: 42
- Views: 15942
Re: Too rich / too lean
I think you have two problems:
1. Bad ECU
2. Bad AFM
Can you get one more of each??
Chris.
1. Bad ECU
2. Bad AFM
Can you get one more of each??
Chris.
- Tue Mar 28, 2023 5:43 pm
- Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
- Topic: Too rich / too lean
- Replies: 42
- Views: 15942
Re: Too rich / too lean
Does the tachometer appear to work correctly?, i.e. stable, and an accurate representation of engine speed?
The AFM does not need to be calibrated to the ECU.
Chris.
The AFM does not need to be calibrated to the ECU.
Chris.
- Mon Mar 27, 2023 7:37 pm
- Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
- Topic: Too rich / too lean
- Replies: 42
- Views: 15942
Re: Too rich / too lean
If you have not got this already, here is the factory manual for diagnosis: www.cowdery.org.uk/downloads/FlapperManual.zip Are you taking all of your readings from the ECU connector? (that eliminates any wiring problems). The system is 'open loop', so if the sensors are correct, it will run OK. It d...
- Thu Mar 16, 2023 1:32 pm
- Forum: Engines Area
- Topic: offset grinding a 4.6 crank to reduce stroke?
- Replies: 8
- Views: 6822
Re: offset grinding a 4.6 crank to reduce stroke?
One comment I can make about 4.2's is that they can break the crankshaft! I can't remember the details, but there was a guy on this forum who had worked for Land Rover 'back in the day'. In fact, the post was probably 10 years ago at least! The gist was that you could snap the 4.2 crank fairly easil...
- Wed Mar 15, 2023 9:13 pm
- Forum: Engines Area
- Topic: offset grinding a 4.6 crank to reduce stroke?
- Replies: 8
- Views: 6822
Re: offset grinding a 4.6 crank to reduce stroke?
Are you sure that 3.9 and 4.2 rods are the same? If they are, then I guess the pistons must be different?
Chris.
Chris.
- Sun Mar 12, 2023 7:59 am
- Forum: Engines Area
- Topic: Rover V8 3.5 main cap girdle?
- Replies: 3
- Views: 5087
Re: Rover V8 3.5 main cap girdle?
I suppose it depends what problem(s) they are having. I would go for the later block with crossbolted main caps, but have it top-hat linered.
Chris.
Chris.
- Thu Mar 02, 2023 7:35 pm
- Forum: Engines Area
- Topic: Crossbolted 3.5 build thread - many questions
- Replies: 15
- Views: 9744
Re: Crossbolted 3.5 build thread - many questions
Also note that the biggest nuisance is getting clearance of oil filter and cooler pipes around the front diff.
On the P38, the diff is on the other side...
Chris.
On the P38, the diff is on the other side...
Chris.
- Thu Mar 02, 2023 7:35 pm
- Forum: Engines Area
- Topic: Crossbolted 3.5 build thread - many questions
- Replies: 15
- Views: 9744
Re: Crossbolted 3.5 build thread - many questions
Just be aware that Thor uses a 60-1 trigger pattern, rather than 36-1 like GEMS. This one is a Thor flywheel (although for reasons that escape me, the trigger feature is at the wrong radius, so I had to move the crank position sensor to detect it. It was also rotationally offset!) DSC08839.JPG And t...
- Thu Mar 02, 2023 8:08 am
- Forum: Engines Area
- Topic: Crossbolted 3.5 build thread - many questions
- Replies: 15
- Views: 9744
Re: Crossbolted 3.5 build thread - many questions
Just a note on using a flywheel as the trigger wheel - the GEMS engines had a 36-1 configuration, and Thor uses 60-1 (I think). So you have to make sure the flywheel you use is compatible with the ignition system you use. Also, as far as I know, the flywheels are all the same size, but drilled diffe...
- Tue Feb 28, 2023 6:45 pm
- Forum: Engines Area
- Topic: Crossbolted 3.5 build thread - many questions
- Replies: 15
- Views: 9744
Re: Crossbolted 3.5 build thread - many questions
Sounds like a great project! I've done some similar things over the years in my Landie. You seem to be well on top of your research, top marks there! My comments: - I went distributorless with a P38 front cover. First go was with MegaJolt + EDIS8 + Thor coilpacks + flywheel trigger (and carbs). That...