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Low MPG, but high compression |
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1day 
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Joined: 02 Jul 10 Location: london Status: Offline Points: 79 |
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 Topic: Low MPG, but high compressionPosted: 17 Feb 11 at 14:05 |
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Hi
Haven't been on here for ages, but my LT motorhome has been out and about, and then parked and covered for the snowy / frosty / rainy months of autumn and winter. I've got really bad fuel consumption figures... 12 - 14 mpg on town and motorway runs. (1979 LT35 - 2.0 petrol, 61,000 miles, solex carb) I compression tested last weekend, hoping for signs of leaking valves... but the figures are high (almost as new according to my haynes manual) cylinders 4,3,2,1 - 165 160 160 165psi The outer ring of plugs (which are fairly new) where carbon coated when I took them out, but not the core. I've cleaned them up of course, but presuming this is indicating rich fuel mixture... but would this cause such bad MPG?  |
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so42
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Joined: 19 Sep 10 Status: Offline Points: 93 |
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Posted: 17 Feb 11 at 19:14 |
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Can't help you mate but my van 1980 2.0L is just the same.
I feel its running rich. Points are spot on and timing looks ok but MPG is bad and it's a bag of wind. Mine is a 10,000 mile from new minter too! Roll on summer then I can get my splitty out! |
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mat_the_cat
Vanorak 
Joined: 06 May 09 Location: North Wales Status: Offline Points: 1862 |
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Posted: 18 Feb 11 at 09:06 |
Rich fuel mixture = too much fuel, so you've answered your own question there! I'd check the air filter/intake for any signs of blockage (I have had a mouse set up home in mine, making a pile of nibbled foam pieces for a next!) Failing that, is the choke stuck on? |
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Mid engined, 6 cylinder, turbocharged 2 seater - it can only be a VW LT!
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AndyT
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Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Posted: 19 Feb 11 at 23:30 |
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Change your plug leads, given that 2 plugs are ok and 2 not. £3 quid each.
If it was all of them then it could be the carb, but I don't think so. Next thing to change would be the coil, mine cost £12. Fuel consumption will at best be 17-20mpg, which is why I converted mine to lpg. |
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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mat_the_cat
Vanorak
Joined: 06 May 09 Location: North Wales Status: Offline Points: 1862 |
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Posted: 20 Feb 11 at 23:53 |
 Good point! The images didn't load and I skim read the thread! |
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Mid engined, 6 cylinder, turbocharged 2 seater - it can only be a VW LT!
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so42
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Posted: 06 Mar 11 at 22:56 |
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Fixed mine now. Wow it drives like a new van again. Pulls like a train and super smooth.
When it comes down to it you have to go through everything from start to finish and don't take anything for granted. All the story's of 2.0L LT's being gutless I thought was true as mine was just the same but get the points, timing and carb set and wow. It may be the super low mileage of mine but I'm sure if you set aside time to sort it then it can be dialed in. |
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1day wrote: