Forum:
I recently replaced the engine in my 96 hijet MPV 1.0 litre. I got the engine from the scrap yard. When I first started the engine, it smoked quite a bit, but the smoke became less and less apparent. I took it for MOT but it failed the emmissions part slow and fast idle. When I run it in the driveway, I cant really see smoke, maybe a little, but this is in bright sunlight. The shop said it was probably the head gasket. Compression test says 180 PSI in all three cylinders though. It does seem to bog down sometimes, but this is intermittent. Any help would be appreciated. Thanks.
Hi Jet smoking, failed MOT
I would look at 2 OR 3 culprits
Cheapest first:
The first likely is valve stem/sleeve wear. This can be tested easily by driving along, taking your foot off the gas pedal and the putting it down again whilst looking in the rear mirror. A puff of blue smoke would indicate valve stem wear. Black oily deposits in the exhaust pipe is also an indication of oil burning. Check also for smoke puffing out of the oil filler cap.
The second is Piston ring wear or a broken oil ring but the compression gained from your test could be enough to disprove this as an option provided each pot was withing the tolerance % of difference. Never the less it is worth removing the plugs and checking for oil fouling on each or all.
The third, LAMDA sensor may be sending the incorrect info to the EMU which may be upsetting the mixture.
The Forth would be the CAT which unless funtioning correctly will upset the emissions test and fail the MOT. Hear in France I had the same on an A6 Audi and the test centre are not allowed to say what may or may not be causing it. The local dealership diagnosed the CAT, not cheap but you may be able to get one from Ebay or the like if that is the suspect.
Finally the engine is generally worn and the smokey start on initiall installation could have been residue oil in the combustion chambers from transferring the engine from the scrappie to the resting place in the Hi jet. I'm afraid you will hear many times that engines from scrappies are always risky and you don't need me repeating that however with the high compression figures and low if any variation between your pots I would suspect that the engine is genrally in fair order.
OLDMINIMAN
M J Young
Smokey
What I have done so far:
I pulled the dipstick and the oil was overfull, very thin, and smelled of fuel. I found a post in this forum about some vacuum hoses: http://www.daihatsu-drivers.co.uk/node/5764 I think I got that sorted.
I changed the oil with a thicker oil and put in some stop smoke.
Well, it is still smoking but not as bad. I have put a few miles on it and no fuel smell from the oil anymore so I hope that is sorted.
I will test the Lamda sensor today (we call them oxygen sensors) and maybe replace it anyways just to be safe.
I am now pricing head gaskets. I have valve stem seals from a failed fix on the previous motor and I will put them in as well.
I hope I can get this sorted as this van has been out of commision since October.
Thanks
PASSED!!!
Well, the little van passed the MOT yesterday. Thanks to everyone for their advise.
What I ended up doing: I tried alot of things, but what ended up fixing it was valve stem seals and a new head gasket. Dont know which exactly since I had to take the head off to do the valve stem seals but I think it was the valve stem seals since the compression test was so consistent and it was not losing any coolant.
I also used some CD2 for oil burning when I put it back together to help with the rings since I definently didn't want to rebuild the bottom end. Did this help? I dont know, I usually dont go for the additives prefering to fix the actual problems but sometimes you have to cross your fingers and jump!
Well, thanks again to everyone.
P.S. I have opened up another subject for valve lash since I do not have a manual (does anyone?). I had to remove the camshaft to get the valves out, I just measured the lash before I took the cam out and put the lash back where it was. This seemed to work but the valve train is a little noisy. Does anyone know these measurements? It is a cb-42 engine. I found the measurements for the CB-41 Engine on this forum as hot .20mm +/- .05mm. Is it the same for both engines?
Hi Jet smoking, failed MOT
I agree with what OMM has said but I would try a couple of other tests first
1 "sniff test" the coolant tank, a sniff test is a test for carbon monoxide in the water tank which would tell you if the head gasket has gone using a syringe type device with a special chemical in. if the chemical detects engine fumes the chemical changes colour, takes about 5 mins to do
2 I would change the oil using a decent amount of engine flush (or derv) to clean out the pathways/oil ways
3 try a couple of cans of cataclean or upper cylinder lubricant
4 I would redo the compression test with the engine cold. Testing each cylinder twice, once as it is and the second time with a tablespoon of new engine oil being poured down the sparkplug hole first. If there is a difference in compression readings i.e. higher after the oil is added then it could be piston ring wear, bore wear, or sticking piston or oil rings
Smokey
What I have done so far:
I pulled the dipstick, and the oil was overfull, thin and smelled of fuel (no signs of coolant though
) I found a post in this forum about vacuum lines to the fuel pressure regulator and hopefully got that sorted (http://www.daihatsu-drivers.co.uk/node/5764)
I changed the oil and used a thicker oil and some stop smoke. I put a few miles on it, and the oil did not have fuel in it anymore, but....
It still smoked, but not quite as bad. Today I will check the Lambda sensor and might just replace it anyways to be safe.
I am ordering a head gasket and I already have some valve seals from a failed attempt to revive the previous engine.
I will put these on and hope it works.
Thanks