Supercharger makes spitting sound

[Thomasp1717]

Hey, I have a 1998 Grand Prix, and under medium to heavy acceleration the supercharger kicks on and makes a loud spitting sound and the check engine engine light flashes, it's throwing the "P1646D, Boost control solenoid control circuit" code. I honestly have no idea what could be wrong. Never dealt with supercharges before, any help is appreciated

[Fivefingerdeathpunch]

Flashing check engine light means possible catalyst damage.

Which useally leads to misfires.


If it was me I would replace all the spark plugs and replace the boost control solenoid.

[Thomasp1717]

I just put new spark plugs in about a month ago, so ill probably pickup a boost control solenoid and see if that fixes the problem

[Fivefingerdeathpunch]

Which brand?

Also double check that none of the wires came off the plugs.

[Thomasp1717]

AcDelco rapid fire plugs, ill have to check the wires too

[Thomasp1717]

Which brand?

Also double check that none of the wires came off the plugs.

I checked on auto zones website and they don't have a Boost Control Solenoid, but they have a Supercharger Bypass Solenoid. Are they the same thing?

[Fivefingerdeathpunch]

I believe so.

[Scottydoggs]

AcDelco rapid fire plugs, ill have to check the wires too

these plugs? Ac-Delco-Rapidfire | AC Delco Plat/Spark Plug (14) | AutoZone.com

if so theres your problem, they are plats.

run copper core or iridium plugs.

[Thomasp1717]

these plugs? Ac-Delco-Rapidfire | AC Delco Plat/Spark Plug (14) | AutoZone.com

if so theres your problem, they are plats.

run copper core or iridium plugs.

Platinum plugs are that bad? I thought they were recommended

[Fivefingerdeathpunch]

For some GM cars, the 3800 called for a Iridium style plugs from the factory.

The waste spark ignition system doesnt like platinum plugs.

[ericspecullaas]

Platinum plugs are that bad? I thought they were recommended

better question were does it say they are good on this forum? copper or Iridium work the best

[Scottydoggs]

nope, they suck in our engine. iridium i or copper core is the way to go.

the plats cause misfires, like your getting with the sputtering. its a misfire or 6.......

[Thomasp1717]

Well I guess I'll try new plugs first then

[Scottydoggs]

the iridium's will last a good 70,000 miles or more. the copper plugs 12 to 15,000 tops, the copper are cheap at 2 bucks a plug. people with a good amount of mods run the copper for the most part. all stock stick to the iridium's.

[ericspecullaas]

or if you just got a replacement engine copper are best just in case the engine you got has mods and you didnt know. thats what i did and my car loves them

[1996pontiac]

I run NGK iridium's in mine with the acdelco plugs.

[Scottydoggs]

I run NGK iridium's in mine with the acdelco plugs.

you use 2 different plug types at one time? NGk and acdelco are not the same company. pick one or the other.....

myself i use only ac plugs.

[Slick2500]

Im guessing he meant wires.

[ericspecullaas]

I run NGK iridium's in mine with the acdelco plugs.

personally i would love to see this he does say acdelco plugs

[TLSheff]

Techinically ACDelco plugs are NGK Iridiums...

just sayin.