variator
Full Member
Posts: 95
-83 Matra Murena 2.2
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« on: August 21, 2013, 11:07:21 pm » |
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Hello, I'm new here on the forum and as a Murena owner, and I will first say that I think this seems like a forum with members who possess a lot of great knowledge and it is a nice tone here. Have taken a preliminary review of the car and found a few errors that I have to get corrected eventually, but no major flaws. The car runs rough, both at idle and at speed, and it also has a "hesitation" by forcing. I assume this must be due to carburetor. Have checked vacuum hoses and I now believe this to be ok. Got hold of a 34CIC carburetor that has been mounted on a Citroen CX, does anyone know if this can be mounted directly on my car? (a -83 2.2) Seller had used the repair kit on the carburetor sitting on the car, this obviously had no effect on the problem. Pictures of my car are coming! Regards Terje from Norway
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2001 Saab 9-5 2,3T, 1981 Porsche 928, 1981 Honda cb 900 F, 1968 Triumph Trophy TR6R, 1986 Yamaha RD 350 YPVS
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uberprutser
Full Member
Posts: 67
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« Reply #1 on: August 22, 2013, 12:24:12 am » |
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Welcome, and happy motoring with your new car I would swap the jets with the onces from the original carb. But also consider the distributor as a source of your problems. Has the car been standing for a long time?
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RazorbackNOR
Sr. Member
Posts: 494
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« Reply #2 on: August 22, 2013, 10:26:17 am » |
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Hello Terje, where in Norway are you? Drammen here. I have some contacts with other Murena guys from Hønefoss, Hamar, Oslo and Akershus. This might sound quite similar to the problem with my car, I have the original carb, also cleared out the vacuum problems(I think), but still stutters when trying to accelerate more then gradually. There is a accelerator pump, which gives the carb that extra squirt of petrol when accelerating. the membran on this might not be up to spec, since I believe this is not replaced in the gasket kit. There is also from the "pump" a oneway valve then passing from the lower half of the carb to the upper, this might be clogged, preventing petrol from flowing to the nozzle. Also beware that the o-ring on this spigot is not supplied in the gasket kit either, Anders on the forum has made his own post about this problem. http://dinsen.net/murena/carburettor/maintenance
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2010 Mazda 3 1,6 Diesel Gunmetal Blue 1983 Matra Murena 2.2 Platine 50cc Pocketbike IPSC shooter
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variator
Full Member
Posts: 95
-83 Matra Murena 2.2
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« Reply #3 on: August 22, 2013, 04:41:50 pm » |
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Thank you very much Uberprutser and RazorbackNOR! I live in Valdres RazorbackNOR, not many Murena here I'll tell you! It looks like I have a leak in the headlight lifting mechanism after all, I can not lift headlights after I turned off the engine, this could be the reason for the erratic engine? Which of vacuum outlet of the intake goes on headlights, the right or the left (seen from behind)? And RazorbackNOR: I do`t think the guy in Akershus have his car anny more:) Sorry Kjetil, it was not with ill will that I referred to you as "gay", it was a terrible mistake in my spelling! ))))))))
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« Last Edit: August 22, 2013, 10:51:25 pm by variator »
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2001 Saab 9-5 2,3T, 1981 Porsche 928, 1981 Honda cb 900 F, 1968 Triumph Trophy TR6R, 1986 Yamaha RD 350 YPVS
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matramurena
Sr. Member
Posts: 125
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« Reply #4 on: August 22, 2013, 08:17:47 pm » |
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the gay in Akershus Welcome! Your Murena. Sounds like a proble in the vac-system. Hope you can find it soon. Can you maybe tell me some more about driving the Murena in Norway? I go there every year on holiday (and we have a long-term plan for moving there) Just three weeks ago I was close to you, spending a week in Beitostolen... But I always drive the Avantime or Pontiac Trans Sport. The roads don't all seem to be very Murena-friendly. If not for the holes and such then at least because of the speed-bumps. They almost launch my Pontiac when driving over them at the speed allowed..... Cheers, Martijn
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1983 Matra Murena V6 (AR engine) 2003 Matra Avantime 2.0T Expression 2003 Matra Avantime V6 Privilege
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RazorbackNOR
Sr. Member
Posts: 494
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« Reply #5 on: August 22, 2013, 10:06:15 pm » |
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Thank you very much Uberprutser and RazorbackNOR! I live in Valdres RazorbackNOR, not many Murena here I'll tell you! It looks like I have a leak in the headlight lifting mechanism after all, I can not lift headlights after I turned off the engine, this could be the reason for the erratic engine? Which of vacuum outlet of the intake goes on headlights, the right or the left (seen from behind)? And RazorbackNOR: I do`t think the gay in Akershus have his car anny more:) Not many in Drammen either... One easy why to check if the vacuum has any influence on the running is to take a bit of decent size hose and fit between the two outlets on the intake manifold. Infact, I have already driven your car! From what I remembered it studderd just a little if accelerating a bit hard, mine isn't even roadworthy with the way it's acting.... I do believe that it is a membran in the accelerator pump which is your problem. Can't tell you which goes where now, since I don't have the car in my garage here now. By the way, your car was rel fun to drive!
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2010 Mazda 3 1,6 Diesel Gunmetal Blue 1983 Matra Murena 2.2 Platine 50cc Pocketbike IPSC shooter
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variator
Full Member
Posts: 95
-83 Matra Murena 2.2
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« Reply #6 on: August 22, 2013, 11:25:21 pm » |
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Thank you very much Uberprutser and RazorbackNOR! I live in Valdres RazorbackNOR, not many Murena here I'll tell you! It looks like I have a leak in the headlight lifting mechanism after all, I can not lift headlights after I turned off the engine, this could be the reason for the erratic engine? Which of vacuum outlet of the intake goes on headlights, the right or the left (seen from behind)? And RazorbackNOR: I do`t think the gay in Akershus have his car anny more:) Not many in Drammen either... One easy why to check if the vacuum has any influence on the running is to take a bit of decent size hose and fit between the two outlets on the intake manifold. Infact, I have already driven your car! From what I remembered it studderd just a little if accelerating a bit hard, mine isn't even roadworthy with the way it's acting.... I do believe that it is a membran in the accelerator pump which is your problem. Can't tell you which goes where now, since I don't have the car in my garage here now. By the way, your car was rel fun to drive! It was fun that you've run my car! From what I've seen so far it is in very good condition, interior is very nice! To blend the two outlets I also intend to do, but it was smart to use a hose between them. Do you know what the second outlet goes to, is this for the brake servo? Is there a WEBER carburetor that is "bolt on"for the Murena? And Martijn: The Norwegian roads are a disgrace and you really got to try them on your trip to Beitostølen! When I run the Murena I must stick to the good roads But I would like to welcome you to Norway, many of your fellow citizens are allreddy arrived here! Sorry Kjetil, it was not with ill will that I referred to you as "gay", it was a terrible mistake in my spelling! ))))))) Update: Have now closed both vacuum outlet of the intake manifold and the engine was behaving much better, was not shooting in the exhaust when I let up the gas, so I definitely have a leak in the vacuum system! But the engine was still poorly and unevenly at idle. Then it remains to find the leak in the vacuum system and why it will not idle properly. Anybody have any idea where I should look? I have replaced the vacum hoses in the engine compartment.
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« Last Edit: August 23, 2013, 03:41:32 pm by variator »
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2001 Saab 9-5 2,3T, 1981 Porsche 928, 1981 Honda cb 900 F, 1968 Triumph Trophy TR6R, 1986 Yamaha RD 350 YPVS
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Jon Weywadt
YaBB God
Posts: 1002
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« Reply #7 on: August 26, 2013, 05:14:29 pm » |
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--------------- Anybody have any idea where I should look? I have replaced the vacum hoses in the engine compartment.
Welcome to the forum variator. You mention that the headlights cannot be raised after the engine has been shut off. They should be able to raise and lower a couple of times with a properly tight vacuum. If they don't move at all it must be a pretty big leak. The problem could very well be in the headlight vacuum motor (cracked membrane), the lift solenoid or the hoses to/from the motor to the lift solenoid. Also the hose from the engine compartment, but that could also affect your breaking power. Does it brake properly? and how well do they lift/lower with the engine running? But since it affects the engine performance also check that the vacuum reservoir in the right side of the engine compartment, behind the ignition coil, is intact. We have seen them be cracked before. On mine the hoses to the reservoir were dry and cracked. But I also had a leak in the lift solenoid and cracked hoses to the lift motor. Good luck.
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Matranaut par excellence
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variator
Full Member
Posts: 95
-83 Matra Murena 2.2
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« Reply #8 on: August 28, 2013, 09:37:18 pm » |
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Thanks for all the great input! I found the reason why the headlights are not lifted with the engine of. The hose running from the intake to the vacuum reservoir was cracked and after replacing the hose and most of t-pieces (they were brittle as biscuits) everything worked as it should.
Then I changed the spark plugs and spark plug wires and the engine seemed even better. Last modification is that I have mounted electric fuel pump. I first mounted a pressure pump but this beat so loudly that I switched to a suction pump, this works like a dream! I have not removed the mechanical pump yet, but intend to do so and clog up the opening with a steel plate where the pump was located.
Jon: Do my car also have a vacuum motor?
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« Last Edit: August 28, 2013, 09:45:41 pm by variator »
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2001 Saab 9-5 2,3T, 1981 Porsche 928, 1981 Honda cb 900 F, 1968 Triumph Trophy TR6R, 1986 Yamaha RD 350 YPVS
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northmurena
Sr. Member
Posts: 210
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« Reply #9 on: August 29, 2013, 12:01:46 am » |
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Hej Terje, welcome to the forum and congratulation to be a Matra-owner. a Murena do not have a seperat vacuum-motor ( sorry Jon for answering sooner ;-) ). All the vacuum is produced by the engine. And - of course - that causes problems many times. It´s a long way and plastic cracks when it is getting old. I changed my car to an electrical vacuum-pump. Since then the engine is running also much smoother, even when it is cold. If you understand german, here´s a link : http://matraforum.de/forum/index.php?page=Thread&threadID=4924&highlight=My solution is what you can find posted by "Heimkehrer". Hilsen fra Danmark Kai
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