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| M102.962 Vacuum issue/ done cyl headgasket + stem seals + tappets; After lots of work... vacuum leak | |
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| Tweet Topic Started: Wed Apr 18, 2018 9:03 pm (222 Views) | |
| Grey_One | Wed Apr 18, 2018 9:03 pm Post #1 |
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Newbie
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Hi everyone, The car's 4 gears manual 118hp 1985 2.0E. It used to do 60mph in 2nd gear and 90mph in 3rd gear. Overall mileage of engine is under 200.000, close to about 300.000Km to be precise.. Been around the forum with another username, won a trophy in 2016 at MB gathering for oldest car on site and a left hand drive in the UK for that matter, hope some remember me. Finally done the cylinder head gasket, was giving all the bad signs, it didn't blow... but was getting to that point of no return. Also done valve stem seals and tappets. Overall clean... Car's been doing 50 miles on a quiet day, 150 miles on a busy day, 90mph on motorway all the time. It's had clutch, flywheel, starter, all suspension, brakes done, I've been using and abusing it for years and quite fond of the little panzer... Fuel intake manifold/metering head was cleaned etc. After the job, the car would... not really have any power output. It was never a rocket, but, it was quick to rev and pickup speed with its 4 gears + reverse.. Cylinder compression at 170-185 on all 4 cylinders. Up from 145-160... Replaced spark plugs, plug leads, dist cap as well. Now... I put the heating on and SURPRISE - no heat output at max setting! I've had that in the past with some action around the dials/dash - because of a disconnected vacuum pipe - loss of engine power and no heating output when set to 'red' on the two dials. Therefore... I suspect something has happened when the electric windows were wired up - as mine had old school manual windows. I suspect somewhere in the process, something went very bad. I didn't check the heating and the next day I drove 750km with some very very bad weather. The engine has little power uphill. The engine would sound like a purr at idle, but there was no power and it would cut out when turning wheel at idle, so the guy who's done the job - he's working on classic cars/ 25 years mechanic in his 40s suspected the problem to be related to mixture/timing... but clearly massive c0ckup... No heating = vacuum issue = fuelling up/ metering head related. We increased idle and adjusted mixture... drove it slow for first 1000 miles. I have no power uphill... engine has no pull. Is like having about 70 horsepower... or something like that, and the mpg is rubbish... was ar 25-30mpg with my driving, now is worse then that.. Before the headgasket, I would go uphill at 90mph with minimum help on gas and use engine break 2nd 3rd gear 30 50mph, now it just like cuts out if I leave the acceleration pedal if low revs. I'd say obvious vacuum issue. Any thoughts? Checked behind the dials, seems to be connected, so must be the vacuum pipes towards the fusebox links, right? Many thanks for any help to again and not
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| Grey_One | Thu Apr 19, 2018 6:59 am Post #2 |
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Newbie
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Heater valve - possibly the vacuum actuator has been disconnected/damaged? Find it odd it would fail out of the blue, there is no coolant leak whatsoever... I know there's been some action there...as wiper assembly was taken off, greased etc |
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| Grey_One | Fri May 11, 2018 2:07 pm Post #3 |
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Newbie
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And to answer - the problem lies with the fuel pressure regulator / valve. In high RPM engine is like starvin' marvin' Changing it Tuesday.. Happy days 15L /100Km |
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| optimusprime | Sat May 12, 2018 10:55 am Post #4 |
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Part of things
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You can check vacuum by the use of a nice cigar .Light up and remove a vacuum hose and deposit the smoke down the hose .Noe look for its exit/, |
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| Chunk | Sat May 12, 2018 1:01 pm Post #5 |
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Spammer Zapper
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Crafty way of getting to treat yourself to a fine cigar As long as the method works, it's all good. |
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| raglits | Sat May 12, 2018 4:10 pm Post #6 |
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Newbie
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I might try that with a cloud of vapour instead just to check mine
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| Grey_One | Mon May 21, 2018 10:50 pm Post #7 |
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Newbie
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Finally some action on this post. Here's the thing.. went to a 'new' mechanic, said it's the fuel pressure regulator that's at fault. Changed it, improved a bit but: Car seems to be stuck around 140Km/h on motorway, simply won't accelerate more. Before the change of cyl head gasket (by a mechanic that I've seen rebuild an EVO II 190 engine), car would like...NOT STRUGGLE uphill at 140-150Km/h. Now it just goes fine up to a certain RPM then it sounds like a choked kitten instead of a rottweiler, I'm out of F**£&$£&"$ ideas, please help! Might be: timing, fuel pressure or... NEW PARTS: dizzy cap spark plugs and leads injectors cyl head gasket valve stem seals tappets clutch etc etc Now the issue is clear: car seems to, in all gears, accelerate steady up to a certain RPM, then... bang, loses pull, like a diesel instead of petrol - I know that petrol has more power in higher RPM. Engine sounds like it's losing its balls, judging by the exhaust sound... So what could it be because my last mechanic f'd it all up in a rush to get it going, and my bullshit meter went off scale, to a level of wishing 'break a leg ' or a both hands would come true... So all in all, when I bought the car it barely had 200.000 real km 5 years ago. Now it has under 300.000km (180000 miles) but some idiots happened because I cheaped out on good mechanics which are impossible to be proven good ANYWAYS! (after some beers and a shitty day). Seems to be a pattern of all incompetent fools... 'car is old' - but the problem is simple, everytime I changed mechanic was to rectify the last imbecile that told me car is old! I know it is old... it is a mechanical car not electronic calculated to fail by design... Edited by Grey_One, Mon May 21, 2018 10:53 pm.
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| Grey_One | Mon May 21, 2018 10:56 pm Post #8 |
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Newbie
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Hi. Doesn't seem to be a vacuum leak after changing the fuel pressure regulator. My question is... fuel pumps can lose their PSI causing pressure fluctuation? Clearly an issue in high RPM... I am changing the fuel pump and other pressure regulator valve thing next to it tomorrow, then I am doing a compression test. I just need it to do 100Km/h in 2nd gear(of 4) as it used to... now that I was told compression went up from 145-160 to 170-180, should go better, right? |
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again and not




9:37 AM Jul 11