Warm idle sounds like i have a cam any ideas ? Ive cleaned the plate and throttle body ,plugs ,wires

[oakley]

87 grand national idle low when warm ,cleaned throttle body and plate ,wires ,plugs .any ideas?

 

[TIMINATOR]

Aftermarket parts?
Miles on engine?
Idle vacuum, steady?
Has it been sitting, how long?
Fuel pressure,
Aftermarket maf, computer stuff?
Been getting worse, or a new development?
Need more info to help!
TIMINATOR

 

[oakley]

Just got it a month ago been mostly sitting for 22 years driven a couple times every year .in very good condition

 

[hensleyt]

not enough information yet
answer all of Timinator ?
The we will have 7 more.

 

[oakley]

I also checked out all vac lines looks to be good but I didn't fog the system

 

[oakley]

I'm the 2nd owner the guy I got from is family and he worked at gm and ordered it in 86 .no mods

 

[oakley]

New gas tank ,sending unit ,pump I had put in before driving it from Michigan to Florida. Also new tires 84,000 miles on the car

 

[TIMINATOR]

Drain fuel, then 10 gallons new gas, add injector cleaner in tank, idle and drive around gently for 10 miles let it sit for a hr. Or so. Repeat.
See if it cleans up.

 

[oakley]

Fuel and oil pressure not sure ? Digital dash mostly dummie lights.got a pod to add oil and boost from glow shift

 

[oakley]

Fuel and oil pressure not sure ? Digital dash mostly dummie lights.got a pod to add oil and boost from glow shift

 

[oakley]

On the way home from Michigan (1300 miles) I added Berryman b-12 in every tank

 

[hensleyt]

Mods are not OE chip will need to find a new home in a box.
Old injectors need to go too.
Timing chain is Junk
valve springs Junk
35 yearly cars are not almost new.
My Cristal ball is broke and you will break this Buick too if not carful

 

[TIMINATOR]

Then O2 sensor, TPS (don't forget to set idle at. 45 full throttle at 4.6v.)
FIRST!!!! change oil and filter ADD ZDDP ADDITIVE! RUN THE ENGINE TO 2000 RPM AND HOLD IT THERE FOR 10 MINUTES! MINIMUM Before doing any idling!
Change radiator water/antifreeze.

 

[oakley]

I also got a new coil pack coming but it's on back order .new spark wires went the extra mile and spent 200 on some really great ones ,put in ngk spark plugs that were recommended highly

 

[oakley]

Changed the oil and filter in Michigan and when I got home so 1300 miles two changes .I'm new to the turbo world but this car came out the year I graduated from high school yes I'm old ! But this car has been on my bucket list for ever

 

[oakley]

Timanator thank u for helping me out

 

[TIMINATOR]

These cars were the first SFI motors, but they used the old stupid computer. Sensors, connectors and grounds are the biggest issues with these cars. Garbage in equals garbage out, with ALL computers.
Timing gear is a big deal, they dry out and crack/disintegrate with age not just miles. Sensors and connections too.
I would change oil often for a while so the fresh additives can work their detergent action on the interior parts that may have corrosion or shellac on them. It's cheap insurance.
Look at the fusible links at the starter, they use rubber insulation on them so if they get hot or melt, they will stink as an indication of problems. BUT that insulation dries out and cracks and falls off and can cause a short.
TIMINATOR