6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHcar starts then dies immediately
Leading reported evidence
Check physically the intake tubing and connections, and tried
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
I checked physically the intake tubing and connections, and tried inspecting the oil filler tube.
Leading evidence: 'Check physically the intake tubing and connections, and tried' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check physically the intake tubing and connections, and tried' (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 · Original poster
I checked physically the intake tubing and connections, and tried inspecting the oil filler tube.
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Suggestion · Original poster
I drove it 15-20 miles after I got it running but then waited until I had the exhaust finished to drive more.
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Suggestion
The engine computer needs to know what engine it is running with the right mapping.
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Suggestion · Original poster
I checked the test port with a rag and there is certainly pressure.
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6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T183130Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi all
I've got a 2001 C4 cab with a 3.2 engine I recently swapped in. I drove it 15-20 miles after I got it running but then waited until I had the exhaust finished to drive more.
Now the exhaust is on and I went to start it and it fires up to 2000ish rpm and then dies. No codes are listed from my basic obdii app. If I press the gas pedal it will keep running. If I unplug the maf, it keeps running with huge rev swings and pinging(so I turned it off).
I have not reflashed the ecu yet but have heard from others that although it helps, its not absolutely necessary for boxster/996 swaps and it ran fine before I let it it sit.
Things I suspect
Vacuum leak to crankcase
Throttle issue
Other vacuum leak/secondary air issue
Old battery- I did have it charging and it reads 12 volts and goes higher when I start the car and give it gas
Fuse/electrics
Things I'm less wary of: Spark/fuel because it will run if I give it gas. I checked the test port with a rag and there is certainly pressure.
Anyone have recommendations about how to go about diagnosing other than parts darts?
You definitely need to tune the ECU to your new setup.
The engine computer needs to know what engine it is running with the right mapping.
Besides that, have you done a Throttle Body adaptation by keeping the key in the on position for 1 minute, and then starting the car?
Thanks all.
I checked physically the intake tubing and connections, and tried inspecting the oil filler tube. I don't see any cracks or problems. I didn't check the aos but it is new so it would need to have been an installation problem.
Coolant temperature sensor says the right temperature(I was thinking it was maybe reading high and going into closed loop right away).
I did the throttle reset.
fuel pressure registered 50psi, and I can hear it rushing if I jumper the fuel pump.
ive got a new MAF on order as the old one looked dirty(stuck with a KN air filter because I had to custom route the intake hose) but I'm thinking engine management could be a part of the issue(or at least magnifying it)
One thought I just had is that The fuel has been sitting in the car for about 6 months now...hmmmm. Could be part of the issue I suppose...
"One thought I just had is that The fuel has been sitting in the car for about 6 months now...hmmmm. Could be part of the issue I suppose..."
Oh geeezzzzz... watch out for exploding pistons!
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