25 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCar barely starts and then shuts off
Leading reported evidence
Replace maf, put the stock tune back
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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Performed · outcome unconfirmed · Original poster
i can’t find any leaks, changed the maf, put the stock tune back on, tried with / without maf, looked for air leaks and unhooked wires and can’t find any of that.
Leading evidence: 'Replace maf, put the stock tune back' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuse' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Make sure you check the line(s) on the intake runners (both sides) where the intake plenum attaches...
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Suggestion
Need to remove one of the coils and check for spark when the engine dies.
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Suggestion
Maybe disconnect the negative lead on the battery to reset the ECU.
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Performed · outcome unconfirmed · Original poster
i can’t find any leaks, changed the maf, put the stock tune back on, tried with / without maf, looked for air leaks and unhooked wires and can’t find any of that.
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Rennlist: 1 discussions
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I removed mods from my car and for the life of me I can’t figure out what the problem is. The car ran fine prior to reversing the mods.
i reinstalled the stock headers / exhaust, intake plenum, throttle body / air intake and removed the aftermarket underdrive pulley back to stock. Since that it sorta starts, chokes and then shuts off within seconds, it’s like it’s running really rich and flooding or something.
i can’t find any leaks, changed the maf, put the stock tune back on, tried with / without maf, looked for air leaks and unhooked wires and can’t find any of that. After many hours I am lost. No CEL, no errors in the ecu. I verified numerous times that the black o2 sensors are pre cat and they greys after cat.
i tried the on 60s off 10s throttle adaptation and for whatever reason it’s not showing any adaptations in durametric? Under ecu there is no basic settings tab? Is that only on the 996.2?
ideas? What should I look for in durametric?
Huh. Spark, air, fuel. Reversing the mods. Back to stock tune.How? Maybe disconnect the negative lead on the battery to reset the ECU. Check the fuse for the fuel pump, and relay. Anything else done? Latest version of Durametric? Is the Durametric communicating with the DME/ECU? Also, it is really important to make sure the intake plenum for the TB is centered and the clamps are tight.
I used the software tool to reverse it back to stock, done that before several times so I know that works
did the battery disconnect, no difference
fuse is good, I removed it and then it wouldn’t start at all after the first try, put it back and now it’s doing the same thing so it’s a t least working
the latest durametric and it communicates fine
I may have to remove the TB / plenum and see if somehow it’s getting air around it but I put it on pretty tight so I don’t think it’s that.
if I give it about 25% throttle as I start it the rpm’s go up but then it dies right after that
strange
Need to remove one of the coils and check for spark when the engine dies. You will need someone to help or else with this. Do this and report back. If there is spark then do disconnect one of the fuel injectors and check if they get power with a noid light. You will need someone for this too. Also, can you jump the fuel pump relay to make sure something isn't shutting it off after the engine fires?
Sounds like you got a big ole vacuum leak.
Remove the air cleaner and leave the MAF disconnected. Have someone hold the throttle slightly open and start it while you try to keep it running by spraying wd40 or carb cleaner into the throttle body.
If it revs like crazy each time you shoot a shot of flammable liquid into it, then you have a huge vacuum leak and are getting way too much air for the fuel that's being injected..
thanks I have one of those smoke systems for finding leaks so I may give that a try, if it�s anywhere it�s on the plenum because that thing is a pain, especially in the nice cold here lol
my bet is you have a leak at one of the rubber collars that attach the intake plenum.
i have had this exact problem after removing the plenum and 1 of them wasn't lined up correctly.
So turns out you guys were right when I wrestled the plenum on there was a small gap at the back that I couldn’t see, once I fixed that it worked perfect!
I will add another part that if you don’t have everything lined up properly you can also block those holes where you hook the vacuum lines because I noticed I did that yesterday as well. If you put the plenum to far to either side it will block them. I got a little piece of wire and stuck it in the hole to make sure it wasn’t blocked afterwards. The IPD plenum was much easier to install lol.
I had exactly the same problem when reinstalling my plenum after doing the AOS vent line. When alerted to the possibility of gaps from this forum I disassembled and during reassembly noticed there are little bumps and ridges on the plenum (maybe only on the right side?) to guide install into the correct center position. They are obvious in retrospect.
What holes? The rubber connections that the big hose clamps are used? I just did my AOS and yesterday when I came to a stop, I felt a stumble when the SAI kicked in, and noticed my Volt gauge drop for a split second.
