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The more I repair my car, the more faults I find. The entire EGR and vacuum system is somehow connected incorrectly. I also have error code 54 (EGR system).
Does anyone have an idea, a diagram of where which hose goes?
What is connected to blue, yellow, green (?) and where does orange go (seems to disappear in the wiring and goes to the left side of the car)
Thanks for any help.
Since this is a 1984 Recaro/TA with 29tmls, I would like to keep it as original as possible.
If by "orange" you mean that vacuum line, then it goes to "yellow" at that end, and to the MAP sensor at the far end, near the brake booster.
"Blue" is the baro sensor. It measures ambient barometric pressure. Remember, "vacuum" - the most reliable indicator of engine load / driver demand - is THE DIFFERENCE BETWEEN the pressure INSIDE the intake manifold (MAP), and the pressure OUTSIDE it (baro). To get the most accurate reading, particularly at high altitudes where the ambient pressure changes by ALOT, requires knowing BOTH. Hence, the sensor that measures the pressure in the world at large, and doesn't get a vacuum line.
Pretty sure "green" is the vacuum supply to the Thermac in the air cleaner.
Might want to look through this thread right here. https://www.thirdgen.org/forums/tech...iagrams-i.html The diagrams don't change much, if at all, from year to year, LG4 vs L69, or Camaro vs Firebird; so it's not like you have to have the particular one for your year etc. right down to the paint color. The carbed cars are all the same with only very minor differences.
The little metal clip dangling on top of the distributor is supposed to be clipped to the edge of the windshield cowl. Those are the windshield washer lines.
Although of course, the "vac sensor" in the diagram is mislabelled (in spite of the fact that it was GM that labelled it so); it DOES NOT sense "vacuum", it senses "Manifold Absolute Pressure". "Absolute pressure" means "independent of ambient pressure"; which of course, "vacuum" is NOT independent of ambient pressure. Vacuum is more like "manifold relative pressure". The sensor REALLY ACTUALLY TRULY senses MAP.
Wow, thank you so much for all that input ! I'm not very good with the technical terms in english... I'm trying to figure out what goes where and then trying to find an image of the part by searching on the internet so I can locate it in the engine bay.
My 1984 Trans AM was built as an "Export" vehicle. It has a QJ & thus no ecm. I removed all the excess vacuum line & associated TVS units. I believe that I have four primary vacuum line remaining. no more, egr, heat riser, etc. Vacuum for distrib advance, thermo packs, cruise control (it is teed), i forget the 4th. Car runs great.
03-26-2024, 10:54 AM
