Thread: L67 Intercooled Oldsmobile Silhouette Minivan

pretty cool. we had a guy charlie who did the same to a montana i think?

Hhaha that's awesome. Nice work!

http://www.grandprixforums.net/threa...now-with-vids* i found this way to easy lol

you have a tuner? with a ic and pulley drop i hope you got headers as well. a tune would sure wake it up even more.

would headers even fit in there? I have a silhouette i never thought all that would fit in there not that i would put another penny into that pile mommy missile of mine...its funny tho. i 2nd the tune your gona want to do that be for you get squirrely in that 7 seat beast.

dyno tunes dont always go so well, cause most shops dont know how to tune these cars. be cheaper to buy a tuner then just hit the dyno for fun.

with your canned tune thats a good start, get a way to scan for KR and timing and fuel trims, then you can see how your running. run only 93 octane too.

Originally Posted by Scottydoggs

dyno tunes dont always go so well, cause most shops dont know how to tune these cars. be cheaper to buy a tuner then just hit the dyno for fun.

with your canned tune thats a good start, get a way to scan for KR and timing and fuel trims, then you can see how your running. run only 93 octane too.

I've never done any kind of tuning before, I'd definitely like to learn how though, that would be a great skill to have. You're probably right about getting it dyno tuned, I haven't found anybody who's experienced tuning these engines in my area through some searching,

I have an aeroforce scan gauge as well, so I can check for knock and fuel trims and I understand those decent enough. Before the I/C it had very little KR and the short term fuel trims were pretty normal, so if something is up it's probably related. I always run 93 too.

Oh and that Montana looks real clean! I've seen that van before in his youtube videos, they were the only ones I could find of this swap. Hopefully I can get mine looking that nice to go with the engine eventually.

your off to a good start then.

short term mean nothing. its the long term fuel trim you want watch. when tuning your goal is to get it close to 0 wot, then like -5 or so idle and cruising.

neg is rich, pos is lean. on the rich side is better then the lean side.

double check the plug wires, we all cross em up time to time. or just maybe yo cracked more then one plug installing them.

you replace them injectors? if it was pouring raw fuel out the dp, id do a oil change asap. that might have fouled the plugs too.

Awesome Van!

could be a bad icm as well. the part under the coils. you can have them tested at autozone, but they also tend to test good when bad. new they are pricey, but used they are rather cheap 20 to 40. good junk yard pocket part.

did the cel ever flash when you floored it? that could be a clogged up cat. who knows if the down pipe is from the mini van or a gtp or what ever it came from. na engines tend to clog up cats more then the sc'ed engines.

thats fine, it replaces the res, does the same job, i ran one for many years myself.

back to the flashing, thats almost always either a bad cat, or misfires due to needing a tune up real bad. im sure it didnt flash before the ic install, so best to start with what you last touched. the plugs and wires.

you can shut them gaps to 0.50 if you like too. stock is 60 why they looked so damn huge.

if your plug socket does not have a foam insert, pull all the plugs look for cracks.

Originally Posted by Wes2k8

The new plugs were gapped to .055, the plugs that looked huge were the original plugs I pulled before installing these. The gap in those looked like it could be a legit 0.100. I haven't checked to see what is going on with these yet. I might try stepping them down more if none are cracked, but there is no foam insert in my plug wrench, and I'm really starting to think it's a cracked plug. One specifically in the back was really difficult to get to and it probably got cracked during all the messing around with it.

id be willing to bet you cracked more then one to get a 300 code, thats multiple misfires. a proper socket will have foam inside and a nut at the top of it you use a wrench on it.

that rear plug thats blocked by the o2 sensor, that one i put the socket on the plug, then a 3 inch extension on the ratchet, then i can get just the tip of the extension in the socket and break it free, then remove by hand. install the same way. thread it in by hand, then hit with the socket to make tight.