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Text of the page (random words):
411 412 problem areas www type4 org documentation www type4 org history spotting the year colors us market options and accessories m 0 m 99 m 100 m 199 m 200 m 299 m 300 m 599 m 600 m 999 dealer accessories prototype ea 142 factory photos advertising technology 411 412 problem areas finding the numbers decoding chassis numbers decoding engine codes wiring diagrams pictures by model year prototypes 1969 model year 1970 model year 1971 model year 1972 model year 1973 model year 1974 model year customized 411 and 412s owner customized 411 and 412s emergency vehicle 412 police car 411 taxicab undated photos various 411 pictures various 412 pictures clubs and weblinks finding parts salvage yards commercial vendors collectibles model cars autosculpt cursor eko gama kit toys magic minichamps schuco stelco volkswagen design study wiking miscellaneous jewelry repair manuals ba 4 heater description troubleshooting component testing heater and ducts component installation combustion air blower fuel pump ba 4 bulletins warning light in temperature regulating switch ribbed heat exchanger and other changes ca only modifications for 1973 models fuel overflow pipe and possible ignition defect overheating switch for ba 4 heater temperature regulating switch l jetronic introduction troubleshooting components test chart buy and sell pricing data events bug in 32 april 10 2005 impressum www type4 org technology 411 412 problem areas 411 412 problem areas a real detriment to recognition of the car as a collectible by vw buffs is the technology used in the type 4 eberspächer gas electric heater if you know someone who can even spell eberspächer you re really lucky the unit is not bad at all but if it fails and you end up knowing zero about it you ll most likely run into all kinds of people preaching about the fire hazards of gas electric heaters i say these people have no clue like with anything the right maintenance is the key any automobile will blow up one day if those precious rubber fuel hoses are left to rot and crack for those who like to believe their own good senses instead of clueless people i put up scans of a gas heater repair manual for the eberspächer ba4 the model used in the vw 411 and 412 parts for it are not available any longer i have seen some for sale at vw swap meets and no junker i ever came across missed theirs because they re a bitch to get at fuel injection up until 1973 the bosch d jetronic prepared the right gas air mixture this system relies on a vacuum sensor which is connected to the intake manifold and measures the air pressure inside hence also called vacuum controlled fuel injection to get an accurate picture of how the engine is doing and how much fuel it needs there are a obviously a few more sensors involved but this vacuum control sensor is at the heart of every d jetronic the bosch d jetronic has a very bad rap people were sent from vw shops to bosch shops and back because few people can work with the system i remember the legendary idiot book by john muir has a few paragraphs about it as well since john writes a little about fuel injected type 3s in his book for parts consult your nearest bosch distributor or salvage yards in the area keep in mind that some vw type 3s the 1600 models with fuel injection had the same system from 1968 till the end of production porsche 914s used the d jetronic on some of the 4 cylinder models as well specifically the 1 7 liter built from 1970 73 and the 2 0 in 1973 and 74 after that porsche decided to switch to the l jetronic thanks to jeff bowlsby for this information the second kind of fuel injection used in the type 4 is the l jetronic instead of a manifold pressure sensor it employs a so called air flow meter to guess at the engine s fuel needs hence its other name air flow controlled fuel injection the air flow meter is a pretty simple device that sits in the stream of air coming into the manifold and measures its amount with the help of a flap the flap is spring loaded and the degree of opening corresponds to the amount of air flowing into the manifold this system was used on type 4s in 1974 only it is a little simpler to maintain and tune but if the engine backfires into the intake manifold the little old flap is usually toast for an overview and a troubleshooting guide refer to the l jetronic manual for parts refer to your bosch dealer or the salvage yard some parts are interchangeable with the l jetronic available for vw beetles after 1975 and in the vw buses with l jetronic the air flow meter however is a type 4 only part nothing else than the type 4 part will fit believe me i ve tried every air flow meter available for aircooled vw engines i know automatic transmission the automatic transmission is something i would have a real trans shop worry about a lot of small parts are still available from vw like switches and pressure sensors as well as gasket kits previous next copyright 1999 2026 jens vagelpohl