volvo 340gl 1.7 shaking on idle
volvo 340gl 1.7 shaking on idle
Hi, I finally bought a 340gl '86 wth 1.7 engine and i have a problem. When the car is not moving and is on idle the engine shakes which i can hear and feel in the pedals. Does any1 know what might be the problem?
Did you only just buy this car?
Remember that the 340 is a car from the 80s and engine vibration damping then isnt what it is now....
further
the counter rotating shafts which modern engines have ( and which the 740 was one of the first cars to have ) which significantly reduces engine vibration.... well... the 340 doesnt have these!!
If you are new to the 340 and are comparing to another car, this vibration at idle might just be normal for the car...
however,
if it is significant, I'd advise checking the engine mounts as this is cause of the vibration in my 1.4 340.....
the mounts are pretty tough but it might be what is wrong....
keep us posted in what you find out....
Remember that the 340 is a car from the 80s and engine vibration damping then isnt what it is now....
further
the counter rotating shafts which modern engines have ( and which the 740 was one of the first cars to have ) which significantly reduces engine vibration.... well... the 340 doesnt have these!!
If you are new to the 340 and are comparing to another car, this vibration at idle might just be normal for the car...
however,
if it is significant, I'd advise checking the engine mounts as this is cause of the vibration in my 1.4 340.....
the mounts are pretty tough but it might be what is wrong....
keep us posted in what you find out....
Enjoy your 300s
I've only just bought a 1.7 myself so in about 4 weeks time when I am home I will be able to get in the car and see how much vibration there is to be expected...
I had a 1.4 with a rough idle and only got the problem figured after a year of trying to sort it... ended up being a missing bolt on one of the engine mounts... However, a common cause of rough idle on the 1.4s is loose carb or even simpler, the crankcase ventilation system gets blocked or the hose that goes from the T piece on the rocker cover to the air filter gets replaced... and....... the original had a restriction built in but this makes for an expensive part so the volvo replacement part was a standard hose and a plastic restrictor piece that you place somewhere along the length of the hose... You had to cut the new hose in order to insert the plastic restrictor piece...
Anyway... getting to the point...
The crankcase breather system when blocked will cause a rough idle..
The 1.7 has a completely different crankcase breather system compared to the 1.4 and the 2.0 360 models.
The crankcase breather system goes through a cotton base ( like cotton wool!! ) filter before the oil vapours enter the engine intake via the air filter. This crankcase breather system is a "service item" on the 1.7s. At regular intervals you need to undo the hose from the filter and clean it out. Further, the filter needs cleaning or replacement. There is the option of opening the canister and cleaning the filter. Alternatively, replace the filter, They are expensive unfortunately at about 20 pounds each.... so you might want to clean it. The filter will have a white mayonaise gunk inside. Dont worry, this is normal. As the oil vapour cools some water also gets trapped and condensed with it... only worry about mayonaise when it turns up on the oil filler cap....
You are in luck though, the same crankcase ventilation system is also used on all the 400 series cars as they have the same basic engine design.....
so...
try the fitler and check the engine mounts...
if the idle is at the correct figure but is rough I would guess crankcase breather or engine mounts.....
The propshaft rubber seal could be failing, causing a vibration but you are likely to hear this also as the props tend to rattle before they break
gearbox mounts.... possibly but I've never seen it... but they are a bit tricky to check... need to lift car on a lift and give the gearbox/diff assembly a good wiggle.....
try these two first and keep us updated on what you discover etc!!!
enjoy you 340!!!
Shimon
I had a 1.4 with a rough idle and only got the problem figured after a year of trying to sort it... ended up being a missing bolt on one of the engine mounts... However, a common cause of rough idle on the 1.4s is loose carb or even simpler, the crankcase ventilation system gets blocked or the hose that goes from the T piece on the rocker cover to the air filter gets replaced... and....... the original had a restriction built in but this makes for an expensive part so the volvo replacement part was a standard hose and a plastic restrictor piece that you place somewhere along the length of the hose... You had to cut the new hose in order to insert the plastic restrictor piece...
Anyway... getting to the point...
The crankcase breather system when blocked will cause a rough idle..
The 1.7 has a completely different crankcase breather system compared to the 1.4 and the 2.0 360 models.
The crankcase breather system goes through a cotton base ( like cotton wool!! ) filter before the oil vapours enter the engine intake via the air filter. This crankcase breather system is a "service item" on the 1.7s. At regular intervals you need to undo the hose from the filter and clean it out. Further, the filter needs cleaning or replacement. There is the option of opening the canister and cleaning the filter. Alternatively, replace the filter, They are expensive unfortunately at about 20 pounds each.... so you might want to clean it. The filter will have a white mayonaise gunk inside. Dont worry, this is normal. As the oil vapour cools some water also gets trapped and condensed with it... only worry about mayonaise when it turns up on the oil filler cap....
You are in luck though, the same crankcase ventilation system is also used on all the 400 series cars as they have the same basic engine design.....
so...
try the fitler and check the engine mounts...
if the idle is at the correct figure but is rough I would guess crankcase breather or engine mounts.....
The propshaft rubber seal could be failing, causing a vibration but you are likely to hear this also as the props tend to rattle before they break
gearbox mounts.... possibly but I've never seen it... but they are a bit tricky to check... need to lift car on a lift and give the gearbox/diff assembly a good wiggle.....
try these two first and keep us updated on what you discover etc!!!
enjoy you 340!!!
Shimon
Enjoy your 300s
That's what it is... I've been trying to suss that. Always make sure your econ gauge goes the correct side of that, else it don't workshimon340 wrote:the original had a restriction built in but this makes for an expensive part so the volvo replacement part was a standard hose and a plastic restrictor piece that you place somewhere along the length of the hose... You had to cut the new hose in order to insert the plastic restrictor piece...
Morgan, depending what year it is, the idle should be around there (I think), the later ones rev'd higher
Edit: Just read it's an '86, so you're probably right!
'89(G) 340 GLE B172k
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
'03 S60 D5 SE, '91 (J) MX5, 1954 Cyclemaster
Ex:
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12; '91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast
Thx for the advise, lately it's been snowing a lot and my car was under a ton of snow, now the snow is almost gone so this weekend i'll check all u suggested and let u know.
Btw. somewhere on the internet I found some documentation with volvo 3xx series specifications, I'll try to find it again, and in that documentation it said that the revs on idle for my engine should be 950 +/- 50 rpms.
My question is could it be that the carb is slightly warped and it's loosing preasure?
Arek
Btw. somewhere on the internet I found some documentation with volvo 3xx series specifications, I'll try to find it again, and in that documentation it said that the revs on idle for my engine should be 950 +/- 50 rpms.
My question is could it be that the carb is slightly warped and it's loosing preasure?
Arek
The carbs on the 1.7 are prone to warping unfortunately. The 440 carb cars ( basically the same engine as the 340 1.7, have a carb cooling system built in... I've wondered if this could be fitted to the 340 carb... )
anyway
a leak carb is possible
one way I've seen ( but never done ) to check this, is to spray propane ( a FINE jet!!! ) near the source of the potential leak. The carb base ( where the leak most likely is ) is a source of vacuum. So the carb top might be correctly adjusted for correct air /fuel ratio but the leak at the base of the carb sucks in air, therefore making the actual mixture that enters the engine too weak ( too much air ) and a consequential poor idle.....
The propane is a fuel source so sucking this in, makes the air fuel mix entering the engine slightly richer ( more fuel ). If when you spray the propane, the idle picks up and the vibration goes away, thats a sign that you have a vacuum leak.
However, the air fuel mix might need adjusting.... I'm not sure the 1.7 have a air fuel adjustment,,, those carbs might only have a idle speed control. I've only ever done serious carb work on the 1.4s so we need to ask some of the other guys here if they know about the 1.7s carbs coz Im not sure
Anyway, there are other sources of extra air...which results in a lean air fuel mix and a poor idle.
Check the vaccum pipe to the servo
the pipe to the recirculation valve ( by the heater ) if you have one
the pipe from the base of the carb ( i know where is goes on the 1.4.... I've only just bought my 1.7 so arent sure where exactly the vaccum lines go on the 1.7 )
any other vaccum pipes anyone can think of??
check these first as this is th simplest cause
also, is th air filter loose? A poor fit onto the top of the carb also allows excess air to enter the top of the carb.. doesnt cause an leaning of the air fuel ratio but the intake pressure becomes variable.... )
there is a paper gasket between the top of the carb and the air filter. Sometimes these waer and fail
good luck and keep us posted
Shimon
anyway
a leak carb is possible
one way I've seen ( but never done ) to check this, is to spray propane ( a FINE jet!!! ) near the source of the potential leak. The carb base ( where the leak most likely is ) is a source of vacuum. So the carb top might be correctly adjusted for correct air /fuel ratio but the leak at the base of the carb sucks in air, therefore making the actual mixture that enters the engine too weak ( too much air ) and a consequential poor idle.....
The propane is a fuel source so sucking this in, makes the air fuel mix entering the engine slightly richer ( more fuel ). If when you spray the propane, the idle picks up and the vibration goes away, thats a sign that you have a vacuum leak.
However, the air fuel mix might need adjusting.... I'm not sure the 1.7 have a air fuel adjustment,,, those carbs might only have a idle speed control. I've only ever done serious carb work on the 1.4s so we need to ask some of the other guys here if they know about the 1.7s carbs coz Im not sure
Anyway, there are other sources of extra air...which results in a lean air fuel mix and a poor idle.
Check the vaccum pipe to the servo
the pipe to the recirculation valve ( by the heater ) if you have one
the pipe from the base of the carb ( i know where is goes on the 1.4.... I've only just bought my 1.7 so arent sure where exactly the vaccum lines go on the 1.7 )
any other vaccum pipes anyone can think of??
check these first as this is th simplest cause
also, is th air filter loose? A poor fit onto the top of the carb also allows excess air to enter the top of the carb.. doesnt cause an leaning of the air fuel ratio but the intake pressure becomes variable.... )
there is a paper gasket between the top of the carb and the air filter. Sometimes these waer and fail
good luck and keep us posted
Shimon
Enjoy your 300s
I went to the mechanic on saturday, he said that the shaking of the engine and vibrations in bedals were caused by the exhaust system which was loose, as for the engine rpms going up and down on idle is that the carb seal has to be changed, he found some other minor problems with the car but it should be ready in few days. I'll let u know when I pick it up if the problem was solved.
Arek
Arek
I got my car back today and it runs great now. The mechanic changed the carb seal and all the filters also he adjusted the carb. From what he told me the carb was set to almost max and it was basically flodding the engine with fuel, but that's the previous owners fault who never adjusted it. He also tightened the exhoust and it doesn't shake anymore 