Lots of cranking needed to start when warm
Discussion
Got new plugs on the way, Will do: leads appear to be new Magnecor jobs, plug extenders are I think the original Beru items but appear in good condition, it has a special A&R Power Amplifier for the coil (so not original). Don't know anything about coil just yet.
Yes, I'm going to check these things first (once I figure out how to). Can resistance be checked on the plug extenders to check their condition? What about the coil?
Yes, I'm going to check these things first (once I figure out how to). Can resistance be checked on the plug extenders to check their condition? What about the coil?
blitzracing said:
The A& R amp is not ideal, you are better off with the Lucas unit if it's still fitted as the Lucas unit is very finely balanced for the requirement of a short dwell on a V8 engine, something the A&R actually makes worse at higher engine RPM. On the HT side this weather is ideal as it's so cold and damp. Go and look at the HT leads in the dark and any tracking or breakdown will be seen by the blue glow around any weak bits as it tracks to earth.
Thank you. So if a lead has broken down, it's spark still has to go somewhere, and if it's not going to the spark plug, it'll be arcing somewhere? I have checked for this at night in the garage with light off but not seen any arcing; I'll double check.blitzracing said:
Sooted plugs are not ignition related as it's a pre cat engine. You are likely looking at over fuellng caused by the AFM voltage being out of spec' or failed water temp sensor.
Same AFM test process as this post.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
I suspect you're right; my engine oil does smell of fuel. Might leaky injector also be the culprit? I'll give all that testing a go when I get a chance. Thanks for your help.Same AFM test process as this post.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Edited by blitzracing on Tuesday 19th December 20:19
blitzracing said:
PreCat Griffith said:
Pre-cat Griff takes a lot of cranking to start when warm (but fine when cold); what are the usual suspects?
I also have a misfire at idle (even to my untrained ear) which may or may not be related, and sooted up plugs. Drives well though.
Sooted plugs are not ignition related as it's a pre cat engine. You are likely looking at over fuellng caused by the AFM voltage being out of spec' or failed water temp sensor. I also have a misfire at idle (even to my untrained ear) which may or may not be related, and sooted up plugs. Drives well though.
Same AFM test process as this post.
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Edited by blitzracing on Tuesday 19th December 20:19
The car starts up from cold and sounds good while idling from cold. Once it's warm though I think I hear it running on not the full 8 cylinders, though it's still smooth. No sign of any arcing under the bonnet in the dark though.
I'm next going to investigate the fuel pressure and injector bank resistance at the ECU loom plug as per: http://www.britishv8.org/Articles/Rover-14CUX-EFI.... Could do with a more explicit guide on where and how to connect the pressure gauge to the fuel rail, so will start searching.
If this yields nothing I think I'll take the plunge and fit BP6ES plugs and replace the coil for one of these: https://simonbbc.com/Viper-Dry-Ignition-Coil-Sport...
And if that fails, I'll replace the ignition amp (although it already has some special RPI Engineering Power Amp). And last resort I'll take the injectors out and see about testing them. Maybe check the earths? Then I'll give up.
Edited by PreCat Griffith on Friday 29th December 13:42
gruffalo said:
Worth checking the fuel temp sensor, when mine went faulty i had exactly this issue started fine from cold lots of cranking when hot.
Tested the resistance of both Coolant and Fuel temp sensors at 11C and they were both around 1500Ohms; since they are both the same resistance at the same temperature, I'm thinking they are both OK.Gassing Station | Griffith | Top of Page | What's New | My Stuff