Thanks SLOmofo, this doesn't even have a tps on it. Are these a 5 volt system like GM used to be?
Shows ya how much I know about a Merc. Which is Nada. :confused
Only a MAP sensor to tell load makes it even more critical. Any leak to atmosphere, pin hole, loose fit of hose or fitting, collapsed hose is going to effect in a major way.
Cars with vacuum controlled objects like an Anti back fire control valve, you would get a backfire even if it got vacuum but the signal was slow(slow vacuum)because the supply port was partly blocked or the fitting which had a filter media in it was dirty with gum and varnish, the hose was soft and would collapse and stick together.
5 volt or reference voltage. There again cant tell you if it does or doesn't. If it does and any way, make sure all ground attachment points are clean and tight. I pull on the wires to see if the wire is broken inside the insulation and then take it off and clean/sand/scrape both the terminal and point of contact. Trouble with wiring is sometimes all the strands are broken except for one. With an OHM meter the resistance will be good but under load that single strand will not pass all the current therefore skew the value due to resistance.
A way check is a
Volt Drop Test. Goggle it. This checks the circuit under load. If there is no load I'll put something like a tail light/brake bulb in the circiut then test it. Bigger wire size a head light. I make sure every thing is disconnected before doing this, cuz I don't like to "Let the smoke out!" of things.
On electrical systems always disconnect the battery, negative first then positive, and then the ECU plug. When reconnecting, ECU then, positive first then negative.
Computers use very low signal strength on many circuits. Electrical noise can/will carry on these circuits. Bad diodes in charging systems and Ignition systems will cause many weird problems. A poor connection at a battery will cause problems.
Electricity is lazy just like water and liberals, they will follow the path of least resistance
