fha772
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| posted on 18/9/13 at 01:31 PM |
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Merc engine cuts at 4400rpm...
Hi all,
I've got a bit of a problem with my Merc.
It revs up ok, but when it gets to about 4400rpm, the ignition cuts, like it's hitting a rev limiter.
I'm stumped, I've replaced virtually everything on the ignition, and I'm running out of ideas.
I need to get it sorted by tomorrow, or I'll be taking my Merc lorry round Blyton on Friday!!
Cheers Frank.
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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bigrich
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| posted on 18/9/13 at 03:18 PM |
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Sounds like the cam position sensor. Does it crank longer than normal before firing. Also is cam tining correct? Or if belt driven the tension correct
.JPG)
A pint for the gent and a white wine/fruit based drink for the lady. Those are the rules
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fha772
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| posted on 18/9/13 at 03:25 PM |
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Sorry, should have said, it's a 1982 2.8 straight 6, with Bosch electronic distributor ignition.
So it hasn't got a cam sensor, or anything like that, it's only 1 step away from points ignition.
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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mookaloid
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| posted on 18/9/13 at 03:43 PM |
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Fuel pump? struggling to cope with higher fuel delivery? restriction in the fuel line?
Just a few ideas - might be rubbish! 
"That thing you're thinking - it wont be that."
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fha772
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| posted on 18/9/13 at 03:53 PM |
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No it's definitely ignition, as I've had the timing strobe on it, and the light starts cutting/pulsing when the engine hits 4400rpm.
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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alfablack
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| posted on 18/9/13 at 03:56 PM |
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Hi is it automatic
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owelly
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| posted on 18/9/13 at 04:04 PM |
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Does it have a mechanical rev limiter type rotor arm? If so, glue it so it can't move.
Is there constant power to the +ve of the coil and pulsed to the -ve side?
http://www.ppcmag.co.uk
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Volvorsport
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| posted on 18/9/13 at 06:17 PM |
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rev limiter in the rotor arm ? spring goes soft ..... vw golfs , maybe the same .
www.dbsmotorsport.co.uk
getting dirty under a bus
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fha772
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| posted on 18/9/13 at 06:30 PM |
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Nope,
I've swapped the rotor, it made no difference.
I've checked the power to the coil, that's fine.
The spark is perfect.
It looks like the distributor is buggered, if the 1 off my spare engine isn't any good, it looks like I'll be looking for passenger rides
on Friday 
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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owelly
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| posted on 18/9/13 at 06:55 PM |
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Bring it along anyway. You can play with my Turd whilst I fix your barge.....
http://www.ppcmag.co.uk
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Nickp
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| posted on 18/9/13 at 07:01 PM |
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quote:
Originally posted by owelly
Bring it along anyway. You can play with my Turd whilst I fix your barge.....
Agreed. So, we need a timing light and a box of matches then? 
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fha772
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| posted on 18/9/13 at 07:16 PM |
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Well, I've got the timing light...
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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T66
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| posted on 18/9/13 at 07:17 PM |
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quote:
Originally posted by owelly
Bring it along anyway. You can play with my Turd whilst I fix your barge.....
You have such a way with word Sir.....
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fha772
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| posted on 18/9/13 at 09:56 PM |
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Well, it's not looking too promising, I've just come in, while getting the timing set up, the starter has died, and I think the
over-complicated fuel pump relay has spat it's dummy out again.
I'm going to have tomorrow on it, maybe into the night again, if I can't sort it, I'll come Friday morning and try to blag as many
passenger rides as I can.
I think I'm going to have to spend some serious time on it this winter...
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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Nickp
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| posted on 19/9/13 at 05:05 AM |
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Matches on standby
You may as well fetch it over teatime then at least you can have a beer whilst trying to fix it mate
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owelly
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| posted on 19/9/13 at 05:10 AM |
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I'll bring an axe.
http://www.ppcmag.co.uk
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Nickp
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| posted on 19/9/13 at 06:26 AM |
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At least we can have a decent fire
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fha772
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| posted on 19/9/13 at 06:30 AM |
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I'll be over tonight, I just won't have a car
It's just too much work for today, along with the stuff I've got to do for the chippy, and the fair, before I leave.
Edit: I wonder if Richard will let me run the lorry...
[Edited on 19/9/13 by fha772]
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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adithorp
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| posted on 19/9/13 at 06:44 AM |
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That's a shame, especially after all the work you've put in to organise it. I can't see you having any problem blagging rides
though.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Nickp
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| posted on 19/9/13 at 06:53 AM |
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quote:
Originally posted by fha772
I'll be over tonight, I just won't have a car
It's just too much work for today, along with the stuff I've got to do for the chippy, and the fair, before I leave.
Edit: I wonder if Richard will let me run the lorry...
[Edited on 19/9/13 by fha772]
If you deffo aren't bringing it then you may as well fetch t'audi Or swing by Gaz's and trailer the MR2 down there maybe?
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russbost
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| posted on 19/9/13 at 08:10 AM |
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quote:
Originally posted by fha772
Sorry, should have said, it's a 1982 2.8 straight 6, with Bosch electronic distributor ignition.
So it hasn't got a cam sensor, or anything like that, it's only 1 step away from points ignition.
Does it have vac advance fitted? If so disconnect it & see if that stops it, it may be that as the baseplate hits a particular position it's
opening a break in the wiring? Otherwise if this is the Bosch distributor with the little ignition amp attached to the side of the dizzy they were
notorious for giving problems (the amp I mean)
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Peteff
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| posted on 19/9/13 at 08:16 AM |
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Is it time for a nodiz ?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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fha772
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| posted on 21/9/13 at 11:23 PM |
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After spending the day thinking about it, I think the Merc needs an ignition upgrade...
...the question is, what do I go for? Megajolt? Nodiz? Or, another?
http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105
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Volvorsport
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| posted on 21/9/13 at 11:32 PM |
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123 ignition?
www.dbsmotorsport.co.uk
getting dirty under a bus
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