dohc v6 Posted October 30, 2007 Report Share Posted October 30, 2007 OK so my car ran great and I need to do some things to it, like ball joints, tie rods, front breaks,ect. So I did everything encluding the a/c compressor and lines. I also did change my 3psi spring to a 7 psi spring in the wastgate. I brought it up to the dealer ship and had a 4 wheel alignment and a/c charge and when I got it back it ran good not under boost though. So I go to give it boost and I get to 3 psi and it hits a rev limiter of some sort. I had this same problem with it no boosting before and it was the FMU vacuum line. But I checked everything, FMU fule lines, FMU vacuum lines, all good. So I am asking what would cause the car not to boost past 3 psi. Any help is well appreciated becasue right now when I give it gas it starts to pull and then it just hits a stop. Quote Link to comment Share on other sites More sharing options...
slick Posted October 30, 2007 Report Share Posted October 30, 2007 How's the spark look? Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted October 31, 2007 Report Share Posted October 31, 2007 Gap your plugs smaller.. the spark is prolly getting blown out when it hits boost. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 Really. Why would it go to 3 psi and then die, You really think that the plugs need to be gapped. Also I think I have platinum, can those be gapped. Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted October 31, 2007 Report Share Posted October 31, 2007 I duno if platnium can be gapped or not... but I can tell you platnium plugs dont like high cylinder pressure... If they made copper plugs for the DOHC use them. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 I mean does the gapping of the plugs really matter that much. Would it cause this problem? I need to know Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted October 31, 2007 Report Share Posted October 31, 2007 gapping of the plugs makes a big difference. and yes it could cause this problem cause if the gap is too big it wont have enough of a spark to ignite everything that your trying to by boosting. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 OK what should I make them. I think they are supposed to be .45 Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 humm, well the gaps are already .35-.38 soooo, what else can it be or should I gap lower. Quote Link to comment Share on other sites More sharing options...
Chancho Posted October 31, 2007 Report Share Posted October 31, 2007 i would go .30 and see what it does, cant hurt to try at this point Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted October 31, 2007 Report Share Posted October 31, 2007 Chipped turbo 3.1s can run .28 gap I believe, it shouldn't be much different for your LQ1 Quote Link to comment Share on other sites More sharing options...
R Dubya Posted October 31, 2007 Report Share Posted October 31, 2007 yeah i would say a good place to start is the plugs. get rid of the platinums and go for standards, you changed the spring so you changed and increased the quality and pressure of the boost. I would say at least .30 maybe lower just like was said. Just because you have spark doesnt always mean its strong enough to run it hard. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 well I just drove the car with the fuel pressure gauge hooked up and it went to 80 psi and then dropped. I guess I can go ahead and try gapping the fronts to .25 and then if it seems to work better then I will go ahead and do the back. Quote Link to comment Share on other sites More sharing options...
dbtk2 Posted October 31, 2007 Report Share Posted October 31, 2007 well I just drove the car with the fuel pressure gauge hooked up and it went to 80 psi and then dropped. I guess I can go ahead and try gapping the fronts to .25 and then if it seems to work better then I will go ahead and do the back. Gapping them to .025" may work better. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted October 31, 2007 Author Report Share Posted October 31, 2007 Talked to TIMG last night. We did some trouble shooting and found that it is more than likly the FPR. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 1, 2007 Author Report Share Posted November 1, 2007 I replaced the FPR and still doing its thing. SO I did a boost leak test. But I have a couple questions. First once I started to pump the IC full of air I heard the wastegate leaking. So I disconnected the vacuum line and pluged the hole on the IC pipe, now I hear a leak at the throttle body almost like its the shaft, but I am not sure. Should the system be pressureized and for how long. I can pump the pump and the air deffinitly leaks right out. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 2, 2007 Author Report Share Posted November 2, 2007 Well I just took the wastegate off and what do ya know, the vacuum line going to the W/G was melted, I mean melted. So I am going to fix it tonight and take it for a ride. I am 90% sure this is the problem but ya never know. Quote Link to comment Share on other sites More sharing options...
dykz34 Posted November 2, 2007 Report Share Posted November 2, 2007 Do you have pics of the setup? Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 2, 2007 Author Report Share Posted November 2, 2007 Yeah under member rides. Well that was not it. Quote Link to comment Share on other sites More sharing options...
Bake82 Posted November 2, 2007 Report Share Posted November 2, 2007 I really think you should re-gap ALL 6 plugs. I wouldn't be surprised is this is your issue. .045 might work well enough for the stock NA motor, but it is WAY too big for a Boosted motor. re-gap and I bet your issue goes away Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 2, 2007 Author Report Share Posted November 2, 2007 well the vacuum line was melted to the wastegate again. I just put it on last night and drove 10 minutes. I will replace this and reroute it and seem, if not then I will do the regapping. But they are already at .35 soo. I can not believe silicone vacuum hose could melt so fsat. Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 2, 2007 Author Report Share Posted November 2, 2007 ok, still did not work. I will go ahead and gap the spark plugs this afternoon and I guess we will see what it does. Should I change my plugs? Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted November 2, 2007 Report Share Posted November 2, 2007 how old are your plug wires? Quote Link to comment Share on other sites More sharing options...
dohc v6 Posted November 2, 2007 Author Report Share Posted November 2, 2007 brand new msd coils, brand new ICM and brand new magnacore wires. Quote Link to comment Share on other sites More sharing options...
Nick1234 Posted November 2, 2007 Report Share Posted November 2, 2007 is the computer pulling fuel? Quote Link to comment Share on other sites More sharing options...
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