Intake PoppIng

[Liljay2003]

Well i was wrong< its still misfire-ing>any other suggest, Coilpack maybe, I dont know but could this be just a fuel deliverey problem it only misfire at high rpm.

[Liljay2003]

How do you check to see if your coil pack are bad< i ran the engine and pull my 6 wire off the pack and it shock the Sh*2 out of me< is there a easier way< what to do > i know my number 6 is good enough< but it sayin Multiple misfire< so do you'll think it a gas issue> I put some injection cleaner and still nothin yet but i guess i will just wait intil it kick in< Full tank or 93 gas and Lucas injector cleaner

[richtazz]

How old are the plugs and wires and what brand are they (you never answered Bnaylor's question so I figured I'd repeat it)? Most high RPM misses are ignition related. If you installed Bosch Plugs (JUNK) or generic branded wires, that is most likely your issue (stick with AC-Delco or Autolite plugs and AC Delco or Taylor [great performance brand and the price won't break you] wires). It is highly unlikely that all your coil packs went bad at once. If only one coil pack was bad, it would only show a misfire code for the two cylinders that coil fires.

[Liljay2003]

Well i took my 6 plug wire off and it shock the mess out of me < and then i just took one off one by one and listen from the popping sound from the coil< sparking> so all my coils are fireing< but i was going to get news one with plugs and wire when i get paid< i was going to get those MSD coil off of 3800performance with the autolite plugs<well i do everything to my car< but i dont think i can change the plugs< i know how but GM has made it pretty tuff to change them so i guess i will just take it to them< anybody have a Ballpark estimate on changing plugs from the dealership> And i really dont know what kind of plugs in there My Uncle change them when my MAF went out about a 60000 miles ago < so is the igntion control mod< the coil packs of something totally different.

[BlueGT02]

Originally Posted by Liljay2003

Well i took my 6 plug wire off and it shock the mess out of me < and then i just took one off one by one and listen from the popping sound from the coil< sparking> so all my coils are fireing< but i was going to get news one with plugs and wire when i get paid< i was going to get those MSD coil off of 3800performance with the autolite plugs<well i do everything to my car< but i dont think i can change the plugs< i know how but GM has made it pretty tuff to change them so i guess i will just take it to them< anybody have a Ballpark estimate on changing plugs from the dealership> And i really dont know what kind of plugs in there My Uncle change them when my MAF went out about a 60000 miles ago < so is the igntion control mod< the coil packs of something totally different.

60,000 miles on cheap plugs/wires could be the cause of your problem. And when you need to check the coils, unpluging the wires at the coil, not only gives you a good zap. But can also start "carbon tracks" on the surface and inside of your coils.(bad thing)

If you pull the bolt on the "dogbone" engine mounts, you can swing the whole motor forward and get the the rear bank a little easier.

Oh and in my opinion stock coils are = to if not better than the MSD's, just my

[BNaylor]

Originally Posted by BlueGT02

If you pull the bolt on the "dogbone" engine mounts, you can swing the whole motor forward and get the the rear bank a little easier.

Removing the engine mounts and tilting the engine to get to the rear bank of plugs is totally unneccessary. I've never had to do that on any of the 3 GM "W" body with SII 3800 I own. All it takes is the right tools and patience.

[wlkjr]

Originally Posted by bnaylor

Removing the engine mounts and tilting the engine to get to the rear bank of plugs is totally unneccessary. I've never had to do that on any of the 3 GM "W" body with SII 3800 I own. All it takes is the right tools and patience.

I'm going to try to do my plugs so I'm wondering what are the right tools?

[BNaylor]

Originally Posted by wlkjr

I'm going to try to do my plugs so I'm wondering what are the right tools?

Don't tell me you have the original spark plugs with over 300K miles.

The front bank is a no brainer but for rear, I use a special 3/8" ratchet with an articulating head. Commonly known as a spark plug ratchet. Also a short extension (3") and a spark plug 5/8" socket with built in universal joint. Also to get to #2 and #4, it helps to remove the bracket that holds the front 02 sensor wiring harness and where you slip in the rear part of the plastic engine cover. Just two 13mm nuts holding it onto the exhaust manifold. For #6 the 02 sensor is in the way but you can work around it or simply remove the 02 sensor and reinstall upon completion. AZ has the special 02 sensor socket for around $9.00. Plus while 02 sensor is out it doesn't hurt to inspect and service it by cleaning with carb cleaner.

The biggest problem you will have is getting the old spark plug boots off so it will be a good idea to have new AC Delco Premium Silicone 7mm wires ready to go. Also, stay with the OEM AC Delco spark plugs. Coat the ceramic of the new plugs with dielectric silicone grease so the next plug service will be easier. Good luck and have fun!

[wlkjr]

Originally Posted by bnaylor

Don't tell me you have the original spark plugs with over 300K miles.

The front bank is a no brainer but for rear, I use a special 3/8" ratchet with an articulating head. Commonly known as a spark plug ratchet. Also a short extension (3") and a spark plug 5/8" socket with built in universal joint. Also to get to #2 and #4, it helps to remove the bracket that holds the front 02 sensor wiring harness and where you slip in the rear part of the plastic engine cover. Just two 13mm nuts holding it onto the exhaust manifold. For #6 the 02 sensor is in the way but you can work around it or simply remove the 02 sensor and reinstall upon completion. AZ has the special 02 sensor socket for around $9.00. Plus while 02 sensor is out it doesn't hurt to inspect and service it by cleaning with carb cleaner.

The biggest problem you will have is getting the old spark plug boots off so it will be a good idea to have new AC Delco Premium Silicone 7mm wires ready to go. Also, stay with the OEM AC Delco spark plugs. Coat the ceramic of the new plugs with dielectric silicone grease so the next plug service will be easier. Good luck and have fun!

No I don't have the original plugs in there. There were changed in Oct of '99 at 126,000 miles. Don't tell me AC Rapidfires aren't good plugs. I hesitate to fool with taking them out. They are probably welded in by now. Not sure what an articulating ratchet is. I've been thinking about getting one of those new ratchets that you can twist the handle either way and it rotates the socket.

[BNaylor]

Originally Posted by wlkjr

No I don't have the original plugs in there. There were changed in Oct of '99 at 126,000 miles. Don't tell me AC Rapidfires aren't good plugs. I hesitate to fool with taking them out. They are probably welded in by now. Not sure what an articulating ratchet is. I've been thinking about getting one of those new ratchets that you can twist the handle either way and it rotates the socket.

There are a lot good, innovative tools available to make the job easier. All I ever use are in the pic below. One standard 5/8" spark plug socket, one with universal, 3" extension, spark plug rachet where the head moves to different angles. Plus it has a special bend and it is longer that the standard 3/8" ratchet. BTW - Nothing wrong with Rapidfire Platinums since they are AC Delco.

[xeroinfinity]

HAHA!
I hav been working on a few GPs over the last weeks.
Done the plugs on one yestarday..

The Manuals stated to tilt the engine forward,
Didnt hav all Day!

I used the 5/8 socket, 3" extension, short swivle(which I didnt really need), and a ratchet.
It took longer to get #6 (3.8) then all the rest combined

Had to get this one from the drivers side , though I droped the plug in the hole , and it took forever to get it out, next time I'll remember the "magnet"

The back plugs in this GP had Never been changed either, pretty tight too.
Also some Anti-seize on those plugs threads works great for the next removal








Now I remember why I hav only had 1 Grand Prix, and it was a 71'

[richtazz]

I use a "wobble" extension and a flex head ratchet similar to what Bob pictured on mine. The wobble gives you just enough flex to clear the oxygen sensor without too much making it hard to deal with. IMO, most socket u-loints get loose as they get old, and flop around to much. You shouldn't have to pull the engine forward.

[edbrycem]

bluegt02 said it would be easier, not that it HAD to be done, and he is right is easier to remove the dogbone in front and it only takes a couple min. and w/ as little room there is back there every little bit matters......just ask your knuckles.lol

[BNaylor]

Originally Posted by bluegt02

If you pull the bolt on the "dogbone" engine mounts, you can swing the whole motor forward and get the the rear bank a little easier.

Originally Posted by edbrycem

bluegt02 said it would be easier, not that it HAD to be done, and he is right is easier to remove the dogbone in front and it only takes a couple min. and w/ as little room there is back there every little bit matters......just ask your knuckles.lol

It is not any easier and will add 20 - 30 minutes or more to the job. Upon reviewing his statement he left out a lot of steps. His statement quoted above implies that you have to remove the mounts which you can see by others weighing in to include me that is not the case. Most 3800 SII engines will not just miraculously drop or move forward after removing both wishbone engine mounts to give you any significant clearance. And getting everything back together specifically moving the engine back into position and lining up the mounts is a hassle and makes a simple job more tedious.

Most hand, i.e. knuckle damage will come from trying to get the spark plug ignition wire boots off or operating the ratchet and not due to the limited engine to firewall clearance which IMO is sufficient.

[xeroinfinity]

YA Bobs right,
you loosen those mounts, and the motor tilts back
And I did hav another secret Tool, the 1.5" extension

And it does add 20mins or so to the job when you remove the motor M.