merchauser

my car has 84k and over the weekend did a diagnostic with the Bosch hammer. Only the hall sensor showed an issue with a short to ground.

Flappy works fine, sensors are fine, no vacuum leaks, and car runs great; idles well, and performance is wonderful.

so, when do I consider an intake refresh? is it mostly a mileage factor, or age, or neglect?

do I wait for symptoms to occur, or is this something that requires preemptive action?

is there anything that car be done to prevent this service, or is it just a matter of time?

anyone out there have a high mileage car that has never needed an intake refresh?

SwayBar

Based upon your report, your throttle position switch, knock sensors, idle stabilization valve, and flappy are all good, I would not touch it.

There is no need at this point in the car's life.

Kevin in Atlanta

How did you know the hall sensor showed an issue with a short to ground? Is this something the hammer reports?

hacker-pschorr

+1

If everything is working, no need to yank the intake. Unless the finish is chipping off & you really want to fix that.

Instead focus on the fuel lines, those can rot through just from age.

worf928

Yes: never turn the engine on again.
It is a matter of time. Rubber on an engine doesn't last forever.

If your '90 isn't leaking oil from the filler neck and cam covers right now and if it isn't leaking coolant from the water bridge then either:
- an intake refresh has already been done
- you've lost the key
- you or the PO have paid 5x the price of a single intake refresh to have individual failures repaired over the last 27-ish years.

See above list.

And mileage has nothing whatsoever to do with it. Rubber degrades due to heat cycles, freeze cycles and oxygen exposure.

worf928

Yup. Even if there's a bit of a oil or coolant leak, postpone the intake refresh until there's something broken. Then, do the full monty intake refresh and you're good for 10-20 years.

merchauser

Kevin, yes the hammer specifically read: hall sensor short to ground

Hacker: the intake finish is chipping, and I hate the way it looks, but can't justify taking it all apart for that reason

is there (even a semi-decent) way to do a little feather sanding and spray can job on the intake so it looks a little better?

Worf: no leaking from water bridge, but my oil filler neck always has a film of oil that I need to wipe off, and my temp ll sensor is "moist". I have read Dwayne and others report about doing an R&R on the filler with intake in place....I don't want to create further leaking by an improper reinstallation.....should I just leave it be??

also, getting off topic, can you retrofit the earlier metal fillers on the later engines? is there any need, or is the issue resolved with a baffle?

Kevin in Atlanta

Interesting - I have the Theo tool and when Kevin W and I checked his car he had a Hall sender fault, but I don't think it mentioned 'short to ground'. Hmmm.

SeanR

LOL, get off the phone with you and this is the first thread that pops up. Good talking to ya man.

merchauser

you too Sean, thanks, as always for the sound advice!! much appreciated. going to try to tape the spades, but just spoke with Roger and he has the sensors in stock for about 150. probably wasting time with the tape...LOL

siscogts

My tps has faulty wot switch and knock sensore 1 gives implausible value to the Hammer. Ok. I know what to do this winter.

SwayBar

Yep, you have to pull the intake to get to both.

PorKen

The EZK doesn't have a way of knowing why it's not working. "Short to ground" or "break in the circuit" are possible faults listed in the WSM for code 2134 "Hall generator signal".

The EZK programmatically checks to see if the Hall sensor changes state (which rotates an ordered list of cylinder numbers for knock sensing).

Kevin in Atlanta

Thanks for the clarification.

worf928

It is possible to get the filler neck out without disturbing the intake about 1/3 to 1/4 of the time. Every 928 is different. Some you can, some you can't.

There is a risk of stripping or breaking each water bridge bolt. About 1 in 12 - 1 in 16 snaps requiring some remedial effort. Intake in place would make it difficult to deal with if it is one of the back two.

Leave it alone until you:
- have a real problem
- decide to do it all before you have real problem.

If you can get a metal filler neck use it.