sooty
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| posted on 27/2/11 at 09:00 PM |
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Pinto - lack of revs
Std 2.0 ltr Pinto with 32/36 dgav Carb
I struggle to rev more than 4000 rpm, checked plug gaps, ign timing and fuel mixture.
Any clues why I'm struggling and what to check further.
thanks
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karlak
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| posted on 27/2/11 at 09:01 PM |
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I had a very similar problem which turned out, in my case, to be a very restricted air filter setup. Removed the air filter and it would rev out.
[Edited on 27/2/11 by karlak]
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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mookaloid
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| posted on 27/2/11 at 09:09 PM |
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slipped cam belt?
"That thing you're thinking - it wont be that."
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austin man
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| posted on 27/2/11 at 09:10 PM |
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will it rev when stationary above that figure or is it when your driving, this will point to different reasons
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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mark chandler
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| posted on 27/2/11 at 09:25 PM |
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I,m with slipped cam belt, if it goes one way you get a perfect idle but no power or revs.
Non interference engine so no worries 
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RichardK
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| posted on 27/2/11 at 09:39 PM |
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If it has always done this? and you're using the mechanical (standard) fuel pump but with no plastic diamond shaped spacer in between the block
and pump flange this causes a very similar issue.
If it has just started doing this, then I'd be inclined to agree with a slipped cam belt.
Cheers
Rich
Gallery updated 11/01/2011
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rusty nuts
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| posted on 28/2/11 at 07:32 PM |
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Check the valve clearances , too tight will cause problems, check for full throttle , restricted fuel and air supply , siezed auto advance mechanism
in the distributor which is common on Bosch distributors , can be checked with a decent strobe light and check the coil is the correct type for the
ignition system you are using.
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sooty
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| posted on 28/2/11 at 08:53 PM |
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Thanks for the replies,
I think I've found the route of the problem, Checked Cam timing - correct, checked igbition timng - correct, checked pump gasket - correct,
checked Carb jets - incorrect. The primary and secondary main jets had been changed by the previous owner by fitting oversize jets of 155 & 140.
This most likely causing over fueling.
Ordered complete new set of jets as per Haynes manual.
I will check out the Dizzy and the valve clearances as suggested.
As for the Coil how do I determine if I have the correct unit, I believe the circuit is Inductive as its uses a Motocraft 83BB 12A199 B3A module.
Thanks
[Edited on 28/2/11 by sooty]
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sooty
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| posted on 2/3/11 at 09:02 PM |
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As for the Coil how do I determine if I have the correct unit for Dizzy, it uses a MotoCraft 83BB 12A199 B3A module.
Should I keep this system or change it to a Points circuit. ?
Thanks
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sooty
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| posted on 3/3/11 at 10:16 PM |
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Fitted new jets as per the Haynes Manual for a 32/36 dgav-
Mains - Primary and Secondary 130
Airs - Primary 165
Airs - Sec 120
Ign Timing set 8degs for Super Unleaded
Plugs gaps checked
Valve Timing correct
Now its worse than before, hesitates more applying throttle for power, still struggles to rev over 4K rpm. If I slowly give throttle it will rev up to
5500. But if I give it wellie to fly, it splutters/spits in carb and struggles. But Revs OK stationary.
Cone filter (clean) fitted in front of rad then hose to empty pancake can on top of carb, checked if getting full throttle.
Next is check valve clearances.
How do I know if I have the right type of ignition coil fitted.
If the Jets are incorrect for a 2ltr, from your experience what would you advise.
Thanks
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rusty nuts
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| posted on 4/3/11 at 07:50 PM |
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Are there any markings on the coil? Have you checked that the timing is advancing correctly? try advancing the timing by ro9tating the distributor ,
if the advance mechanism is stuck then the engine will rev higher at the top end but will idle faster
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Xtreme Kermit
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| posted on 4/3/11 at 08:06 PM |
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The first thing I would do is replace plugs, leads, dizzy cap and rotor arm.
I once had a Granada that did this, it eventually poured enough unburnt fuel into the first silencer box that when it ignited it blew the silencer to
bits... 
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RichardK
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| posted on 4/3/11 at 09:05 PM |
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Have you got a lambda bung welded into your exhaust, If you have I can lend you my Jaw AFR meter, you really could do with finding out how rich or
lean she's running first just so you can rule that in or out.
Have you tried blanking off the dizzy vac then and just running at 15 degrees static advance? Maybe worth a shout, I know a few that run them this way
so can't be too bad.
quote:
Now its worse than before, hesitates more applying throttle for power, still struggles to rev over 4K rpm. If I slowly give throttle it will
rev up to 5500. But if I give it wellie to fly, it splutters/spits in carb and struggles. But Revs OK stationary.
Sounds very much like over fueling symptoms, are the spark plugs black and sooty, sooty??
Cheers
Rich
[Edited on 5/3/11 by RichardK]
Gallery updated 11/01/2011
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sooty
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| posted on 12/3/11 at 07:35 PM |
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OK
Checked:-
Ignition Timing
Valve Timing
Carburation etc.
Renewed HT leads
Renewed Plugs
Renewed Dizzy Cap
Wiring connections Module to Coil/Dizzy (all correct, but several joints (but all connections tight) by previous owner)
Managed to check the colour of the spark from the coil, by holding the coil HT lead approx 5mm from earth and turned engine over.
Colour of spark is Orange, which I believe is a weak spark.???????
Also read somewhere, ford use a Ballast resistor either on the coil or have a Ballast wire to the coil, but has no ballast on the coil or not knowing
if the feed is ballasted.
Do I need a Ballasted coil by either way or can I use a straight high performance 12v coil. ???????
Any suggestions of which coil I should/could use with my inductive dizzy and 83BB12A199B3A Module setup.
thanks
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RichardK
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| posted on 12/3/11 at 07:43 PM |
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I may still have my old coil off my pinto set up, I'll take a look tomorrow mate, my donor had that dizzy and amp.
Cheers
Rich
Gallery updated 11/01/2011
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RichardK
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| posted on 12/3/11 at 07:47 PM |
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Still think it sounds like its running rich, have you a lambda bung in your exhaust? Are the plugs black and sooty have you tried it using static
advance as per my last post?
Cheers
Rich
Gallery updated 11/01/2011
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Andy D
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| posted on 12/3/11 at 08:03 PM |
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Something you could also check. I know from experience if you turn the engine over with the dissy cap off, one of the cap retaining clips can drop in
and jam the trigger wheel. The trigger wheel turns on the spindle, and when the ignition is timed up, the rotor arm isn't nessesarily adjacent
to a plug lead segment in the cap. It could well be running OK untill the vac advance moves the rotor further from the segment.
Hope that makes sense. 
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sooty
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| posted on 12/3/11 at 08:08 PM |
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Thanks Rich
Sorry nothing in the Exhaust for sensor.
Did try smaller jets as in Haynes book of 130 jets primary and secondary, but was worse.
So went back to jets already in carb 155 primary 140 secondary from previous owner.
But as you mentioned rich mixture, the power valve diaphram is faulty with suction test not holding, awaiting new unit.
As for static advance, it makes little effect advancing in 2deg increments to 14 degs with strobe.
thanks
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RichardK
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| posted on 12/3/11 at 08:13 PM |
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Oh ok, was gonna suggest I lend you my afr meter, cos at the mo we're not sure if if its ign or fuel (or both)
plan b then...
Gallery updated 11/01/2011
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jacko
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| posted on 12/3/11 at 08:21 PM |
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Use a timing strobe light and check it is advancing to 34-36% at 3000rpm-3500rpm
you say it is set at 8% that seems a bit low set it to 10 -12% without the vacuum pipe on if its hard to start the engine back it off a little
What happens if you pull the choke on a small amount will it rev better or [ choke up ]
sounds like fuel problems to me is it getting enough fuel to the carb is the pump working ok
sorry if you know all this
Jacko
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sooty
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| posted on 12/3/11 at 09:00 PM |
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Thanks Jacko
Will reset timing as you suggest and check advance at 3.5k.
But the 8deg comes from the Haynes for 97 super unleaded.
No choke flaps etc fitted to try choke as suggested.
thanks
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adithorp
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| posted on 12/3/11 at 09:16 PM |
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Have you checked the valve clearances yet?
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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RichardK
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| posted on 12/3/11 at 09:18 PM |
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Yeh, I know, it also says that every 4th tankful should be leaded! Give what Jacko says a whirl, I would say a little higher but start low and work
up, something in my gut is saying fuel to me though. Either that or wind!
We'll sort it sometime.
Cheers
Rich
Gallery updated 11/01/2011
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sooty
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| posted on 12/3/11 at 09:27 PM |
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OK thanks,
I'll have ago tomorrow, but what about the colour of the spark 'Orange' is that OK. ??
thanks again
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RichardK
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| posted on 12/3/11 at 10:01 PM |
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I'd be more interested in general colour of the ceramic and electrode area of the plug, is it a nice chocolate brown colour rather that the
colour of the spark itself tbh. Is it a nice fat spark though? Just needs to ignite fuel thats all.
Cheers
Rich
Gallery updated 11/01/2011
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