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Engine wont start

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I am sort of reposting as the previous one was buried in a different thread. Sorry if you see this again.

Now the problem,

My 2001 boxster (105K miles) is upset with me and just wont start. The last time it ran, it threw P1126,P1128,P1130,P1133 but ran fine till I got home. Hasnt been starting since the next day morning.

I tried jump starting a few times and also got the battery out and got it completely charged. Still wont.

Any connection between the two problems? What else should I be looking at downstream from the battery?

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ok may be a a dumb question, but can the engine start with the throttle body removed? I am trying to check on the starting problem and was probing terminal 50 on the starter while trying to start.

I see a voltage of about 9.5V and then when I try to jump start by hooking up to a honda civic battery (rated 500 CA), I see a voltage of about 10.5V.

Is this what I could typically expect or is my jump start not sufficing as well? or does it not start just because my TB is out?

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Sounds like you have a bad battery. No way you should see voltages that low while cranking. Try a known good battery before anything else.

Just ran through a similar problem on an Alfa Romeo Spider. That car needs 10.7V while cranking in order for the ECU to send a signal to the coil for spark. My car would turn over pretty good but would not fire. Checking with a meter during cranking showed a voltage of 9.8Vdc. Connecting a charger (on START mode) got the car running for a minute but it died as soon as I removed the charger.

New battery. Problem solved.

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Do you still have the codes after getting the car running with the new battery? I guess you might not know for a while because some take multiple driving cycles before showing up. Nice that you got the car running again anyway.

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