1994-2002 [Subscribe to Daily Digest] |
Burning smells:
sniff at the coil, any signs of overheating?
oil lead from rear seal blows onto cat *
PCV hoses failed or swollen and crank case vapors getting into cab *
oil seal in distributor allows oil to collect inside the distributor *
Commonly reported for these engines and year of build. Most of the engine rear seals would be replaced by now.
no DIC
check that battery cables are clean and tight, ditto for ground cable(s) to engine block, visual for corrosion, grap and wiggle to check for looseness.
Remove battery caps and check levels against the built in 'eyes'. If cell plate tops get dry, you can get deposit bridging and voltage disturbances. Some of which can ignite the hydrogen gas and cause the battery to explode. Top up to 'eyes' using only distilled water. Use eye protection. Risk of explosion with a dry battery is highest when starting, so take note of that.
Check that all spark plug cables and boots are fully seated, 10 ends. Check that the low voltage connectors to the coil are clean and tight. Cables routed properly for separation etc?
Pull cover over the plugs. Any oil pooling in there from leaking valve cover? Good time to inspect/regap/replace the plugs. Blow area free of sand etc before removing the plugs, don't want that stuff inside.
The crankshaft pos sensors fail with age mostly. These have coils inside of them that tend to go open circuit when hot. After things cool down, they will work again for a while. Often after a trip, stop for a short while then will not start until cooled. Might be that when stopped heat is greatest. Not too expensive, not hard to replace or access. At front of engine/trany near bell housing to engine contact plane. Location has changed over time to been located on the engine side to the bell housing. Can't recall with certainty which to what, but you will be able to see it by inspection. No decent cels for these, with or without ODB-II <- not till 1996. When the crank pos fails the ECU does not see the engine turning. There is a cranshaft pos sensor inside the cranshaft drive distributor that can fail, but that generates codes, often long before the engine will not run.
When crank pos fails and vehicle will not start, you can disonnect it and measure ohms and see infinite or open circuit. When working it will measure a few hundreds of ohms. So that much is easy. Getting at the connector on a hot engine might be less than pleasant.
Mas air flow sensors, MAFs, can fail and perhaps become intermittant, but reports of this on this BB are very rare. MAFs not on turbo engines. MAF connector clean and properly seated? Bad MAF should generate CEL.
Every clean injectors with Techron Centrate? You should. Your 10.5 compression ratio will work better for you with the spray patterns of clean injectors and having some of the combustion chamber deposits cleaned up.
posted by 65.68.10...
, Tue, 24 Aug 2004 07:51:16
, Mon, 2 Oct 2006 05:35:07
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