The Hall Effect Sensor ,what are the symptoms of a bad one? 3.8 1993
I dont think that's very helpful to folks with same -whatever- problems you are having.
If it's "pressure in fuel system doesn't hold for restart", I'd check the (easier to get to!) Fuel Pressure Regulator first, since we've got a return fuel system (pump runs all the time, the FPR bleeds excess pressure back to the tank).I have a warm start issue,engine runs great other than that,I'm at 90k,top of engine is rebuilt, I'm pretty sure fuel pump must be going bad. just looking at other stuff before dropping the tank! fuel pressures just not there, after 15 min drive and restart,stumbles and recovers and drives fine,its just when it sits,pressure in fuel system doesn't hold for restart.
Put it on a scope or graphing multimeter and see if there are any irregularities in the signal wave generated by the hall effect.car does have a slight miss occasionally. like when I'm at a red light I can feel it, has had that prob for years, that's why I was thinking Hal effect sensor .plugs,cap,wires replaced also coil, cleaned all sensors.
Mmm?A hall effect doesnt produce a strong signal at low RPM's, so if it were in fact bad, it probably would not allow the engine to start.
Its old technology, thats why newer cars use an MRE sensor, digital output.Mmm?
Seems like that's one of the strong points on the Hall Effect sensor - it's typically driven internally to full swing on almost ANY change in magnetic field, so it produces the same strength field no matter how rapidly it's changing (as opposed to a simple magnetic reluctor, whose strength of output DOES depend on how quickly the field changes).
See, for instance, http://content.honeywell.com/sensing/prodinfo/solidstate/technical/chapter2.pdf for a good explaination (it's the strength of the magnetic field, not the rate of change, that affects the Hall Sensor output. A straight coil? Changes output depending on the rate of change.)
Do you have access to a Fuel pressure gauge ? Many parts stores rent these, they arent very expensive to buy either. At least Ford was nice enough to put a valve on the fuel rail to make checking pressure easy.I'm thinking fuel pump,starting to starve for fuel at cold start. eventually starts
The "cheap" way to shotgun is have a identical good running vehicle to test parts from. Just switch over what you suspect until you hit the part.Just went out and started fine. checked fuel press regulator ,no gas in vac line.
talked to Rick asked again,signs of bad fuel pump,loss of power,missing under load,start issues.have plenty of power ,no missing under load. only warm start issue,
he say's maybe ign control module attached by radiator passager side. think I'll get a pressure gauge and check system cold and aft warmed up,plus hold pressure spec's
can't afford to shotgun parts at it haha!
This sounds like a low fuel pressure problem. Warm start issues are usually not ignition related because warm combustion should occur easier.I have a warm start issue,engine runs great other than that,I'm at 90k,top of engine is rebuilt, I'm pretty sure fuel pump must be going bad. just looking at other stuff before dropping the tank! fuel pressures just not there, after 15 min drive and restart,stumbles and recovers and drives fine,its just when it sits,pressure in fuel system doesn't hold for restart.