CVH backing off...

Silver'Scort · 15-03-2010, 09:14 AM

Hi all, got a weird fault with my '90 carb fed CVH Escort 1.6 sport.
Every so often when under load, usually in 3rd/4rd gear, clog right down, it will begin to back of and bog itself down as if it is being starved of fuel. Usually by dipping the clutch and revving the engine, or sometimes dropping to a lower gear it will clear itself and carry one, however if you keep the foot in, it ill bog itself further and further down until its kangaroo-ing!

The ignition side can be ruled out i would imagine, as its not a regular fault, just as and when, but its had new coil, leads, plugs, diz cap and rotor arm as i had them given with the car so thought i may as well fit them and see if it helps. Only parts that weren't replaced were the ignition amplifier (cant remember if that comes off the dizzy seperate tho with out looking) and the dizzy itself.

If anyone has a suggestion before i start going through the fuel side one bit at a time, it would be great

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tabetha · 15-03-2010, 12:43 PM

Your car will have most likely a 28/32 TLDM, same as used on the later XR2, not a bad carb certainly clean no good power wise but there you go.
Anyway clean out the float chamber, take the float out and blow through with an air line after taking the needle valve out that the float closes, you may even find the float is punctured if plastic, if so dry out then seal hole with glue.
It defo sounds like crap restricting the fuel flow, the normal problem on these when people always drive really gently is the secondary venturi seizes up, this is vacuum operated and they seize through lack of use, could also pull the pipe that feeds the vac unit and suck on it to make sure it holds pressure/vacuum.
tabetha

Silver'Scort · 15-03-2010, 11:51 PM

Ok Tabetha, thanks for that advice, a good mate is lending me a good TLDM weber for me to put on while i take mine off and strip it down to clean it.
Never stripped down a Weber style carb before, done plenty of Motorbike carbs, but it'll be a learning curve

tabetha · 16-03-2010, 06:12 PM

They're very easy, if you remove the secondary venturi vacuum diaphragm top and cut 1 coil off the spring, the secondary venturi will open sooner, make it a bit livelier!!
tabetha

Silver'Scort · 16-03-2010, 10:07 PM

Haha cool, so the vacuum diaphragm, am i right in assuming that is the flying saucer type thing on the top of the carb under the airfilter?

tabetha · 17-03-2010, 03:52 PM

Yes, it will have a small pipe going to the venturi side and a rod out the bottom that attaches to the secondary venturi linkage to operate it.
tabetha

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15-03-2010, 12:43 PM	#2
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	Your car will have most likely a 28/32 TLDM, same as used on the later XR2, not a bad carb certainly clean no good power wise but there you go. Anyway clean out the float chamber, take the float out and blow through with an air line after taking the needle valve out that the float closes, you may even find the float is punctured if plastic, if so dry out then seal hole with glue. It defo sounds like crap restricting the fuel flow, the normal problem on these when people always drive really gently is the secondary venturi seizes up, this is vacuum operated and they seize through lack of use, could also pull the pipe that feeds the vac unit and suck on it to make sure it holds pressure/vacuum. tabetha

15-03-2010, 11:51 PM	#3
Silver'Scort PassionFord Regular Garage is empty, add now Trader Score: (0) Join Date: Dec 2009 Location: High Peak, Derbyshire Posts: 472 Rep Power: 3	Ok Tabetha, thanks for that advice, a good mate is lending me a good TLDM weber for me to put on while i take mine off and strip it down to clean it. Never stripped down a Weber style carb before, done plenty of Motorbike carbs, but it'll be a learning curve

16-03-2010, 06:12 PM	#4
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	They're very easy, if you remove the secondary venturi vacuum diaphragm top and cut 1 coil off the spring, the secondary venturi will open sooner, make it a bit livelier!! tabetha

16-03-2010, 10:07 PM	#5
Silver'Scort PassionFord Regular Garage is empty, add now Trader Score: (0) Join Date: Dec 2009 Location: High Peak, Derbyshire Posts: 472 Rep Power: 3	Haha cool, so the vacuum diaphragm, am i right in assuming that is the flying saucer type thing on the top of the carb under the airfilter?

17-03-2010, 03:52 PM	#6
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	Yes, it will have a small pipe going to the venturi side and a rod out the bottom that attaches to the secondary venturi linkage to operate it. tabetha

17-03-2010, 03:52 PM
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