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CarGuru > Volkswagen > ping problem 18 April 2005 21:28:09

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ping problem
T 15 April 2005 06:25:31
	My dad has a 1965 VW with 1200 engine and it pings occasionally under load at low rpm e.g. when going up a hill. Im not exactly sure when it started pinging but here is what i know. 1. timing set to 7.5 degrees BTDC using static method. 2. vacuum advance seems to work... suck the tube method. 3. valve clearance adjusted to 6 mills. 4. carburetor is a solex/brosol (manual choke)and in good working order 5. compression on all 4 cylinders ranges from 137-151 psi. 6. unleaded regular fuel (87 octane) 7. idle set to 700 rpm and dwell at 700 rpm appears to be about 50%. 8. plugs do not indicate overheating or rich fuel mixture and they are gapped to 25 mills. 9. points are in good shape and gapped at 16 mills. 10. Alternator belt properly adjusted. The pinging seems to happen only when the engine is hot. Other than the occasional pinging, the car has great power and does not miss or hesitate. I am thinking that i should drop the timing down to 4-5 degrees BTDC using the static method. I dont have a timing light but could get one if there was a good reason.... Can anyone give me some tips/tests to isolate this problem. thank you in advance,
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Gaz Pike 15 April 2005 10:05:45 [ permanent link ]
	I'd go with your suggestion of retarding the engine. To do the static timing change, get a car bulb, I use the indicator type, solder two wires to it, the crimp on female spade connectors or eyes if your coil has that type of connection. Connect them to the coil, one on each side and turn you ignition on. Wind the crank around clockwise and see when the bulb JUST goes off, this means the points have just opened. This is your firing point. Check this against the marks on the crank pulley. Aim for 5*BTDC and see what happens. There are some timing references and guides on the Ramva index at www.ramva.tk in the ignition section. I have to assume you're not in the UK as UK unleaded is 95 RON, not the 87 you mentioned. You might also want to try some octane booster. Follow the instructions on the bottle and up your octane. Let us know how you get on. Gaz "t" <tonyhiggins@verizon.net> wrote in message news:1113531931.798575.254880@z14g2000cwz.googlegroups.com...> My dad has a 1965 VW with 1200 engine and it pings occasionally under> load at low rpm e.g. when going up a hill.> Im not exactly sure when it started pinging but here is what i know.> 1. timing set to 7.5 degrees BTDC using static method.> 2. vacuum advance seems to work... suck the tube method.> 3. valve clearance adjusted to 6 mills.> 4. carburetor is a solex/brosol (manual choke)and in good working order> 5. compression on all 4 cylinders ranges from 137-151 psi.> 6. unleaded regular fuel (87 octane)> 7. idle set to 700 rpm and dwell at 700 rpm appears to be about 50%.> 8. plugs do not indicate overheating or rich fuel mixture and they are> gapped to 25 mills.> 9. points are in good shape and gapped at 16 mills.> 10. Alternator belt properly adjusted.> The pinging seems to happen only when the engine is hot.> Other than the occasional pinging, the car has great power and does not> miss or hesitate.> I am thinking that i should drop the timing down to 4-5 degrees BTDC> using the static method. I dont have a timing light but could get one> if there was a good reason....> Can anyone give me some tips/tests to isolate this problem.> thank you in advance,>
		Add comment


T 15 April 2005 21:18:53 [ permanent link ]
	Update: i adjusted timing to 5 degrees BTDC (lightbulb) and there was no pinging so far. But there was a new problem, the car would backfire if i abruptly let off of the gas pedal. I got a little more history on the ping problem. A manual choke carburetor (solex brosol 30 pic) was swapped in a few months ago and it solved a whole set of hesitation and idling problems. However that is when the occasional ping was first noted. I found a post on this site indicating that california gas with its MTBE additive might cause the car to run lean/hot and a possible solution was to increase the size of the main jet. Any thoughts on this? As a first step i am going to try and locate the specifications on this 30 pic and compare it to the 30 pict-1 that used to be on this VW. If anyone has any ideas i would be grateful. thanks
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Adam 15 April 2005 23:05:11 [ permanent link ]
	On Fri, 15 Apr 2005 10:18:53 -0700, t wrote: problems. However that is when the occasional ping was first noted. I> found a post on this site indicating that california gas with its MTBE> additive might cause the car to run lean/hot and a possible solution was> to increase the size of the main jet. Any thoughts on this? As a first You might want to post your problem to the rec.autos.makers.vw.aircooled newsgroup. This group is mostly read by UK people but r.a.m.v.a is a more global group (and is a lot busier). There would be more people there who can share their experiences with California gas -- Adam
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Gaz Pike 16 April 2005 09:07:58 [ permanent link ]
	Ok, you could open the idle mixture jet slightly. This will give the extra fuel you may or may not need. BTW the idle jet is used for about 3/4 of the throttle, not just "idle" as it's name suggests. This will give you an idea if that is your problem without any carb stripping and jet hunting. If you do decide to increase the jet size, there are adjustable mains available (or at least there used to be) that screw into the side of the carb. I've got one, somewhere, for the 34 pict 3 carb. Of course, if you go to any tuning shop, they will be able to re-drill the jet for you to the size you want and at a lot less than buying a new jet. Trouble is, if you're wrong about the size you want, you can't go back. The main jet is behind the bolt on the side of the float chamber. When you undo this bolt the fuel will drain out, you'll only need a rag (a thickish one) to collect it. Then a medium sized flat blade screwdriver to undo the jet. I use a regular screw driver to loosen the jet, then a sprung ended one to remove it. These screw drivers have a sprung end that expands into the slot on the jet and therefore it won't fall off the driver when you take it out or put it back in. Your popping on deceleration is caused by a hole in your exhaust. With the engine running, hold your hand close to all the joins and then over the entire exhaust, just don't get burned!!. You should feel a leak, but remember the cooling air coming down will also be flowing passed your hand, so take that into account. I hope this helps. Gaz "t" <tonyhiggins@verizon.net> wrote in message news:1113585533.349359.150080@z14g2000cwz.googlegroups.com...> Update:> i adjusted timing to 5 degrees BTDC (lightbulb) and there was no> pinging so far. But there was a new problem, the car would backfire if> i abruptly let off of the gas pedal. I got a little more history on> the ping problem. A manual choke carburetor (solex brosol 30 pic) was> swapped in a few months ago and it solved a whole set of hesitation and> idling problems. However that is when the occasional ping was first> noted. I found a post on this site indicating that california gas with> its MTBE additive might cause the car to run lean/hot and a possible> solution was to increase the size of the main jet.> Any thoughts on this? As a first step i am going to try and locate the> specifications on this 30 pic and compare it to the 30 pict-1 that used> to be on this VW. If anyone has any ideas i would be grateful.> thanks>
		Add comment


Tunafish 18 April 2005 21:28:09 [ permanent link ]
	Try running it on higher octane fuel - 87 is pretty low grade especially if it's oxyginated. I would use the VW tuning settings of 7.5 BTDC, valve gap should be 0.10mm (for single port engine) and make sure the points gap isn't too wide, should be fine then. --Steve "Gaz Pike" <gary@kernow49.wanadoo.co.uk> wrote in message news:d3q6jg$4df$1@newsg3.svr.pol.co.uk...> Ok, you could open the idle mixture jet slightly. This will give the > extra fuel you may or may not need. BTW the idle jet is used for about > 3/4 of the throttle, not just "idle" as it's name suggests. This will > give you an idea if that is your problem without any carb stripping and > jet hunting.> If you do decide to increase the jet size, there are adjustable mains > available (or at least there used to be) that screw into the side of the > carb. I've got one, somewhere, for the 34 pict 3 carb. Of course, if you > go to any tuning shop, they will be able to re-drill the jet for you to > the size you want and at a lot less than buying a new jet. Trouble is, if > you're wrong about the size you want, you can't go back.> The main jet is behind the bolt on the side of the float chamber. When > you undo this bolt the fuel will drain out, you'll only need a rag (a > thickish one) to collect it. Then a medium sized flat blade screwdriver > to undo the jet. I use a regular screw driver to loosen the jet, then a > sprung ended one to remove it. These screw drivers have a sprung end that > expands into the slot on the jet and therefore it won't fall off the > driver when you take it out or put it back in.> Your popping on deceleration is caused by a hole in your exhaust. With > the engine running, hold your hand close to all the joins and then over > the entire exhaust, just don't get burned!!. You should feel a leak, but > remember the cooling air coming down will also be flowing passed your > hand, so take that into account.> I hope this helps.> "t" <tonyhiggins@verizon.net> wrote in message > news:1113585533.349359.150080@z14g2000cwz.googlegroups.com...>> Update:>> i adjusted timing to 5 degrees BTDC (lightbulb) and there was no>> pinging so far. But there was a new problem, the car would backfire if>> i abruptly let off of the gas pedal. I got a little more history on>> the ping problem. A manual choke carburetor (solex brosol 30 pic) was>> swapped in a few months ago and it solved a whole set of hesitation and>> idling problems. However that is when the occasional ping was first>> noted. I found a post on this site indicating that california gas with>> its MTBE additive might cause the car to run lean/hot and a possible>> solution was to increase the size of the main jet.>> Any thoughts on this? As a first step i am going to try and locate the>> specifications on this 30 pic and compare it to the 30 pict-1 that used>> to be on this VW. If anyone has any ideas i would be grateful.>> thanks>>
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CarGuru > Volkswagen > ping problem 18 April 2005 21:28:09

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