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Under/over boost on target.....JB4
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02-09-2013, 02:54 PM | #1 |
Second Lieutenant
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Under/over boost on target.....JB4
I have been having some issues with my car the last few months where I am not getting full boost and have checked the vacuum lines...nothing wrong there. I have yet to check the boost pressure, which is not the easiest thing. But I don't think that is the issue, wouldn't I keep losing boost the longer I have the issue? So far everything is staying steady. But doing some research I couldn't find out on the jb4 what the under/over boost on target function did or how to read it. Assuming if it is always in the middle I am good, under WOT I only get to about 1/4 range
I have checked codes and I have the fuel pump plausibility code and just last week I had a cylinder 5 misfire code. Thinking my fuel pump might be going out again, would this keep me from getting full boost? 2007 e90 335i 93 octane always BMS DCI JB4 G5 iso Map 5
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02-09-2013, 05:26 PM | #2 |
Second Lieutenant
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Forgot to mention I can not get over 12psi....if I'm lucky.
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02-12-2013, 03:26 PM | #4 |
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We would need logs...
Move your coilpack to Cylinder 6, see if the misfire moves, that won't cause a boosting problem unless you go into limp mode. The only way you can have a boost problem is if you have a leak. (assuming your tune is fine, which it should be). There are several vac/boost lines on this car, including under the engine cover, near the intake manifold, near the boost canisters by the turbo's. Any could have hairline fracture or leaking under boost. The car will throw an underboost code if you go wide open throttle for 4 seconds and underboost. (30FF underboost code). Charge pipe connection before and after the intercooler also need to be checked. If you have any aftermarket FMIC or charge pipe they are usually the culprit 9/10 times. |
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02-13-2013, 11:06 AM | #5 |
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Check you selonoids, mine did exactly as you are stating...I will post before and after logs.
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02-13-2013, 11:13 AM | #6 |
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02-13-2013, 11:18 AM | #7 | |
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Quote:
1. Charge pipe to throttle body "c clip" may not be seated 2. intercooler connections 3. Brake booster line is plugged in correctly Check lines that go from break booster vacuum lines under the valve cover and go to vacuum canisters (I replaced mine with silicone vacuum lines.
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JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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02-13-2013, 11:21 AM | #8 |
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Im thinking its intercooler connections. My front end was rearranged by a deer a month ago. I just got the car back yesterday. I can hear a ton of air movement but I dont know what to start with. The body shop did a great job on the car, but I just cant bring it back to them as they didnt know much about the car. So Im going to tackle this one. The paint matches, the lines are straight, no over spray anywhere. Just a huge boost leak somewhere.
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02-13-2013, 11:40 AM | #9 |
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All you need to then is get under the car and see if pipes are not attached.
One going in to intercooler and one going out. The intercooler may have been damaged and they did not know, this would cause an excessive boost leak and would require you to replace it. You will need to remove the under paneling on the bottom of the car to get a good look. Otherwise you need to check the remainder of piping post intercooler to your charge pipe which leads to the intake manifold. If this is out of your league I would suggest bringing it to a competent shop or dealer. There are way too many areas to cause a boost leak and without any of us looking at the car we are just guessing. |
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02-13-2013, 12:03 PM | #10 | |
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Quote:
Found it, hole about the 8mm in the charge pipe before the intercooler. Found it quick. Gave me good areas to start. Last edited by WilliamS; 02-13-2013 at 01:36 PM.. |
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02-13-2013, 03:27 PM | #11 |
Second Lieutenant
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I have checked all the vacuum lines and they are good. Checked the boost tubes and everything seemed solid( did not do a pressure or smoke test). If it is the solenoids wouldn't the vacuum lines not hold pressure?
That's why I am thinking there may be a fuel pump issue.
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