144,000 miles and running great, the one driving vans describes hearing a mechanical sound , bang, clang something like that and since these symptoms, #1 lots of smoke from tailpipe not blue smoke and not oil burning smell, smells like normal exhaust , looks gray/whitish cloud of "smoke". (lots of unburnt fuel , also some oil being sucked from top of head when piston downstroke and valve is open)
#2 engine cranks quickly and stays running barly, running on a few cylinders, vibrates badly. (firing order wrong since out of mechanical timing"
#3 alot of crankcase pressure, through dipstick and out of crank vent hose, seems like some suction too, feels like pressure and suction, and sounds that way like an air compressor sound out of the valve cover (valves to pistons out of timming)
#4 knocking sound especialy when engine low rpm almost quits running (labour knock) ( out of time)
i want to buy the van i think if timing chain jumped and valves hit pistons then different symptoms most likely engine would have have quit running instantly
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Remove the Engine Air Filter Housing and look under it for a vacuum line that goes back to the gas tank You will get a gas smell at times because this is an open line to the gas tank and evaporation container. It's common for the rubber elbow there to split and cause issues. Check ALL vacuum lines. The increase in air into the fuel system is causing a backfire "popping sound" and a loss of power.
no it is not. (late answer) is this a double post?
all timing belts jump, 1: every 60k miles for most. ever read the service list. some top quality belts go bad at 100k miles. so.....????
Honda uses an "interference" engine design. do not skip this service, or the whole engine can grenade !!! honda quote, pasted. However, since these engines utilize an interference design, it is
highly recommended to at least inspect the timing belt at 60,000 mile
(96,000 km) intervals. It is an even better idea to replace the belt at
these intervals. On 1990-94 models, Honda recommends the timing belt to
be replaced at 90,000 mile (144,000 km) intervals. On 1995 models, the
recommended interval is 60,000 miles (96,000 km).end quote.
and if the last guy put in a POS china belt, well, you are hosed. no name belts are junk, never ever use one, BTW i run Gates belts.
this does sound like theres a loose line tapping the engine/frame,during warm up the engine idles faster which could make it vibrate faster causing the the clanking or tapping noise,if this has started after trans fluid change,then check the lines running from the trani to radiator sometimes the service person might bang into something causing plastic clips that hold the lines to break,try getting under it and have someone start the truck and listen to see where it's coming from also hold the lines & see if the noise stops,the service guy could have unbolted something & never put the bolt back causing the clank ex.line may have a clip holding it thats bolted to the trani pan ?good luck
If that changes with the speed of the engine then these are not good sounds. Any mechanic will be able to tell you just by hearing what the problem is. It could be something simple like a loose heat shield which is just banging on the side of the engine or it could be a bearing on the crank or con rods. You really don't want to drive this as it can/will cause more damage (more $$ to fix). Without hearing it and without seeing the damage this could be a few $ (ie tighten a bolt) to a new engine. Get an estimate and don't just say fix it or you can spend more than some cars are worth. You can get engines out of the wrecking yards with fairly low miles for about 1/10th the cost of rebuilding but you need to get it out of there and into your car.
Find someone you trust to figure this out. Either someone who knows about cars a bit to go with you or if you are lucky a great mechanic to take it to. If it is a newer car under warranty just go to the dealer and they should fix it under warranty no charge. I don't see a year or model so just be careful about getting someone to fix this as worse case can run a few dollars.
Im assuming it is an engine that uses a timing belt. It sounds like the belt has jumped 1 tooth. if it only jumped 1 tooth than the computer will compesate the timing so it is possible the sensors will say they are ok. If it is a motor that uses a chain than it problaly needs a new gear/chain set.