Pontiac G8 Forum: G8 Forums - G8Board.com - V8 Engine Tech (L76/LS3) http://www.g8board.com/forums en Fri, 10 Sep 2010 19:08:29 GMT vBulletin 60 http://www.g8board.com/forums/images/g8board/misc/rss.jpg Pontiac G8 Forum: G8 Forums - G8Board.com - V8 Engine Tech (L76/LS3) http://www.g8board.com/forums miss when acc. http://www.g8board.com/forums/showthread.php?t=38105&goto=newpost Thu, 09 Sep 2010 11:12:07 GMT Got on it ( 6500 RPM first gear before shifting ) yesterday & was running good. Next thing I know it was running rough & chech engine light comes on.
Not so bad when normal acc. but when I get on it, its worst. Took it to the dealer & left it. They said it would be a couple of days berore they could get to it.
GXP with 8000 milers on it.
Any one with this problem before?:pir_flag: ]]> V8 Engine Tech (L76/LS3) wbja http://www.g8board.com/forums/showthread.php?t=38105 The GT and 89 Octane Fuel http://www.g8board.com/forums/showthread.php?t=38101&goto=newpost Thu, 09 Sep 2010 03:31:23 GMT My G8 seems to be suffering from either the lifter ticking problem or something else I have noticed. The manual says that the car can run on 87... My G8 seems to be suffering from either the lifter ticking problem or something else I have noticed. The manual says that the car can run on 87 octane fuel unless it doesn't perform as well then you should use 89 octane. It doesnt mention the use of 92-93 octane. I have tried a full tank of all three grades and noticed that the engine doesnt shake as much when at idle and runs pretty smooth when using 89 octane and cold start lifter noise is not as pronounced. When using 93, all of the bad symptoms appear. With 87 its just poor performance and lifter/knocking noise. Is there any technical truth to this? Thanks. ]]> V8 Engine Tech (L76/LS3) OspreyG8GT http://www.g8board.com/forums/showthread.php?t=38101 Gave it gas...no go? http://www.g8board.com/forums/showthread.php?t=38080&goto=newpost Wed, 08 Sep 2010 13:13:34 GMT On my way in to work, this morning, I was approaching a light and decided to put it in “manual mode” to down-shift. Was doing about 45, down-shifted... On my way in to work, this morning, I was approaching a light and decided to put it in “manual mode” to down-shift. Was doing about 45, down-shifted to 3rd and then 2nd. Car slowed down, revved kind of high as I put it in 2nd, and then as I was stopped at the light, I noticed a “sputtering” going on so I put the car back in “normal” mode and when the light turned green, the car wouldn’t move, just started drifting. Gave it gas, nothing. Tried to put it in “sport mode”, and then give it gas, nothing. “Manual mode” nothing. So I drifted over to the shoulder and turned the car off and then back on, and it was all good! I drove the rest of the way to work (about 15 more minutes) and didn’t have any more issues. This is the first time i've had an issue like this and I've had the car since May of 09'. Check engine light never came on and I never got any other indicators.


Not sure what happened but has anyone else had a similar experience or any ideas as to what caused it to do that? ]]> V8 Engine Tech (L76/LS3) Dat Dude Trav http://www.g8board.com/forums/showthread.php?t=38080 Cam thoughts on 224/236 .581/.578 118+2 for 2009.5 GXP? http://www.g8board.com/forums/showthread.php?t=38079&goto=newpost Wed, 08 Sep 2010 13:11:27 GMT I'm looking for something that:

1) Will provide a nice wide powerband and fairly smooth idle
2) Works well with my intake and exhaust setup
3) Doesn't have higher lift requiring frequent valve spring changes
4) Will work acceptably with the stock TC with a slightly higher idle
5) Will not have P to V clearance issues without flycutting pistons

Since the car already has 3.27 gears the shift extensions are 5,000-5,300 with the stock TC - keeping me well in the powerband of even a moderate sized cam at all times. I also want to know what I need to replace while I am in there such as the cam tensioner, chain, etc. since I would rather not have a failure down the road.

Thank you for your thoughts! ]]> V8 Engine Tech (L76/LS3) OBSSSD http://www.g8board.com/forums/showthread.php?t=38079 Catchcan chosen, how to get gunk out of engine. http://www.g8board.com/forums/showthread.php?t=38059&goto=newpost Tue, 07 Sep 2010 17:09:55 GMT So, Ive chosen the catch can I want to go with, but Ive yet to find a article of how to get rid of the crap thats already inside the intake track,... So, Ive chosen the catch can I want to go with, but Ive yet to find a article of how to get rid of the crap thats already inside the intake track, any suggestions, techniques, chemicals, tools? Would flushing the stuff, or scraping it out be the best option? Just curious as to what your techniques are for clearing the crud thats already inside is. ]]> V8 Engine Tech (L76/LS3) supermikey http://www.g8board.com/forums/showthread.php?t=38059 Non-intercooled Supercharger on Ls3? http://www.g8board.com/forums/showthread.php?t=38020&goto=newpost Mon, 06 Sep 2010 14:05:03 GMT Hi everyone, Just wanted to get an Idea as to how safe it would be to run a Non-intercooled HTV1900 supercharger on a Stock Ls3 engine? I... Hi everyone,

Just wanted to get an Idea as to how safe it would be to run a Non-intercooled HTV1900 supercharger on a Stock Ls3 engine?

I live in Australia... in an area where the police constantly subject vehicles to searches for "illegal modifications" ... soo I wanted something I could take off reasonably easily if required.

What are your thoughts on a non-intercooled supercharger? What would be a safe level of boost to use ? and is there anything else I could do to improve cool air flow or reduce the probability of detonation ?

I spoke to one tuning shop over here and they suggested roller rockers :confused: ... would that really be of any advantage ? I cannot see how these would have a huge effect ...

any help would be greatly appreciated ... ]]> V8 Engine Tech (L76/LS3) LION_KING http://www.g8board.com/forums/showthread.php?t=38020 Lost switch blade key http://www.g8board.com/forums/showthread.php?t=38001&goto=newpost Sun, 05 Sep 2010 22:04:01 GMT I lost my switch blade key to my 2008 Pontiac g8 gt, its still under warranty cause i only got 27000 miles on it. but will the dealer Replace it an... I lost my switch blade key to my 2008 Pontiac g8 gt, its still under warranty cause i only got 27000 miles on it. but will the dealer Replace it an reprogram it? also when I get the new key will the old lost key still work? if so what can I do an will the dealer charge me? ]]> V8 Engine Tech (L76/LS3) Carson Cail_G8GT 2008 http://www.g8board.com/forums/showthread.php?t=38001 LQ9 Heads work on my 08 GT? http://www.g8board.com/forums/showthread.php?t=37977&goto=newpost Sun, 05 Sep 2010 00:26:25 GMT I am not up on LS series engines so i am wanting to know if LQ9 heads will work on my 08 GT. Ineed to replace mine and found a deal on some worked... I am not up on LS series engines so i am wanting to know if LQ9 heads will work on my 08 GT. Ineed to replace mine and found a deal on some worked over LQ9's but unsure if they will work and maintain the correct compression ratio. These heads i am looking at have 72 cc chambers and i dont know what ours have. Thanks ]]> V8 Engine Tech (L76/LS3) DENALI http://www.g8board.com/forums/showthread.php?t=37977 Somethings not quite right... http://www.g8board.com/forums/showthread.php?t=37966&goto=newpost Sat, 04 Sep 2010 16:31:26 GMT I started noticing a little bit of a strange feel in her the other day. It's slight but I can tell it's there. When I'm giving it some throttle it seems as if there is this ever so slight miss. When idling I can't tell it's there but when I give it normal accleration I can feel it and just barely hear it.

NO CEL... NO codes... Going to the dealer with it but does anyone have any ideas what this might be?? EGR, plugs, valves, lifters???

17k miles and my daily driver... ]]> V8 Engine Tech (L76/LS3) bhayes http://www.g8board.com/forums/showthread.php?t=37966 Engine shakes (Livernois stage 2 cam) http://www.g8board.com/forums/showthread.php?t=37896&goto=newpost Thu, 02 Sep 2010 18:11:20 GMT Hello everyone! I installed Livernois Dod delete kit with stage 2 cam, stage 2 L92 heads, and Kooks exhaust and roto-fab. Tune was mailed by... Hello everyone! I installed Livernois Dod delete kit with stage 2 cam, stage 2 L92 heads, and Kooks exhaust and roto-fab. Tune was mailed by Livernois. And now engine shakes very noticeably at idle. While warming up I can feel the smell of unburned fuel and car shows 6 mpg in city :( And one more bad thing is that while slowing down from 20 to 10 mph engine seems to be trying stabilize himself and it makes hardly noticeable moves forward and back and rpm fall to 500-600 for a short moment. While engine acts like this 5 or 6 knocks can be heard in tranny (knocks look like knock when you move from N to D).
Today I went to the service and made electronic diagnostic to find errors. But it showed that everything is ok.
Please help! How can I resolve all this problems? ]]> V8 Engine Tech (L76/LS3) Jackyboy http://www.g8board.com/forums/showthread.php?t=37896 Gas/Fuel Filter http://www.g8board.com/forums/showthread.php?t=37876&goto=newpost Thu, 02 Sep 2010 03:54:20 GMT Do our cars have one? If so, when should it be changed? Do our cars have one? If so, when should it be changed? ]]> V8 Engine Tech (L76/LS3) MightyMike http://www.g8board.com/forums/showthread.php?t=37876 What electronic WOT switch to use http://www.g8board.com/forums/showthread.php?t=37772&goto=newpost Tue, 31 Aug 2010 01:26:04 GMT I am adding a HSV triple gauge kit with an Autometer wideband A/F gauge. The gauge I am adding can use the peak/hold funtion if you wire in a WOT... I am adding a HSV triple gauge kit with an Autometer wideband A/F gauge. The gauge I am adding can use the peak/hold funtion if you wire in a WOT switch. I found a NX pn 15961 switch but was wondering if anyone can recomend any other options. I want to use an electrnic WOT switch not a mechanical one. ]]> V8 Engine Tech (L76/LS3) tomst http://www.g8board.com/forums/showthread.php?t=37772 Seafoam in the vac line? http://www.g8board.com/forums/showthread.php?t=37750&goto=newpost Mon, 30 Aug 2010 16:09:03 GMT I'm about change the oil in my G8 GT. Before I do, I was thinking of running a can of seafoam into my one of the vacuum lines to clean out any carbon. (GM recommended this for my 01 GTP.) Is it necessary? Anyone else doing this? ]]> V8 Engine Tech (L76/LS3) SVS http://www.g8board.com/forums/showthread.php?t=37750 Planning for future mods, your thoughts http://www.g8board.com/forums/showthread.php?t=37732&goto=newpost Mon, 30 Aug 2010 03:46:43 GMT Ok, as the title says I am starting to do my research now for some future mods to the car. I am looking into the Vector Motorsports Stage 2 cam...
Ok, as the title says I am starting to do my research now for some future mods to the car. I am looking into the Vector Motorsports Stage 2 cam package along with their ported intake, and converter, then have the car dyno tuned. The car is and will remain my daily driver, yes, even in winter. So in that realm I would like to maintain good street manners yet up the ante power wise. First question is will this setup maintain good street manners and drivablility? This is my main concern, if you feel their stage 2 cam package is to big please say so. If you have something very similar to this projected setup let me hear your thoughts and what you like and dislike about your ride. I thought about going with a turbo setup or a Maggie but I really like the stealth look!!! Can't get that with a turbo or a Maggie hanging on the engine. Second question for now is what kind of power would I be looking at. I'm not looking for exact numbers but ballpark type figures. My goal is very low 12's or high 11's, does this sound reasonable for these planned mods? You can see the existing mods I have in my sig, they will stay on the car as well. If you have other suggestions by all means let me know, I'm all ears! Thanks for any insight that you can provide on the subject. Have a great evening! Tony
]]> V8 Engine Tech (L76/LS3) coops09gxp http://www.g8board.com/forums/showthread.php?t=37732 Losing coolant/Over heating http://www.g8board.com/forums/showthread.php?t=37726&goto=newpost Mon, 30 Aug 2010 00:40:03 GMT Last week the car started to overheat out of the blue. While moving it was OK, but stopping would make the temp climb. I checked the fluids and the... Last week the car started to overheat out of the blue. While moving it was OK, but stopping would make the temp climb. I checked the fluids and the overflow tank was dry and I could see no coolant in the radiator. I added around a half gallon to the radiator/overflow and all was well for a bit.

I drove the car for a couple hundred miles and yet again today, the engine temp begins to climb. This time I had coolant in the bottle, but couldn't see any in the radiator.

The only coolant change I have made is the heater hose lines, back in March. I have checked the fans, and they both come on when the AC is activated. I know they go high, because I can hear them just before the engine over heats.

I can't see any evidence of a coolant leak and I don't smell coolant out the tail pipes.

Could I not have burped the system properly and now with the hot weather it's coming back to bite me in the ass?

This time, I started the engine and filled the radiator until it almost overflow. At that point, I put the cap on. I then let it idle for a bit and then held it at 3K RPM for 30 seconds or so, then idle with the AC on. It hit 210 for a little bit but settled around 195 degrees Fahrenheit. ]]> V8 Engine Tech (L76/LS3) Omega http://www.g8board.com/forums/showthread.php?t=37726