How much rust if any.....

[Rickf]

.... should be under the distributor cap and on the reluctor wheel? This is on a 1990 Sierra 1500 2WD.

 

[SUBURBAN5]

Having a 98 I'm no help but I'm gonna lean towards 0 corrosion. However I know it happens so I personally bought cap and rotor with brass contacts and vented cap. I don't have a reluctor wheel .

 

[Komet]

The rust is a factory racing option. Chevy orange, you know. I've got a pretty heavily rusted one and it is operational. My buddy had a very nasty rusted out distributor and it was not operational.

What problem are you trying to solve?

 

[someotherguy]

The magnet area inside the reluctor wheel is often rusty; this is normal. It's bare metal from brand new.

Richard

 

[Rickf]

It has the "accelerator pump" stumble and backfire down the exhaust issue. My friend's shop has a snap-on OBD1 scanner, it's going in next week.

 

[Drunkcanuk]

Have you checked fuel pressure?
And not just at idle, but under load.
I chased a bunch of parts years ago. Finally but the bullet and dropped the tank to do a pump. It was the little hose that connects the pump. Was full of holes from the ethanol. Mines a 91. So maybe something to look at.

 

[Komet]

+1 on fuel pressure, always a good first check on issues like that.

 

[Schurkey]

You must be registered for see images attach

Really common, harmless (except for the cracked magnet.)

 

[Rickf]

The "accelerator pump" and backfiring issue solved. Might have been the ignition module or excessive rust under the cap or both. I over-torqued the #6 screw trying to remove the module (SNAP) and ended up replacing the distributor.

 

[GoToGuy]

Thanks for feedback ! I'm sure a lot of us want to know how your problem was solved.