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PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

car all of sudden went crazy

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Old Aug 27, 2006 | 08:16 PM
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Default car all of sudden went crazy
ok i have a 98 trans am with a T.S. forged ls1, P.P. stage 2 ls6 heads, ls6 intake, ms3 cam and a s.d. tune.

now the problem

i was driving at highway speed and the car went to 11:1 on a dynojet a/f meter and started missing like crazy. as soon and as i let off car died and was hard to start. it ran very rough at any rpm, i can plug the maf sensor back in and it will start better and idle but very rough.. it also threw a s.e.s code that i will scan tomorrow evening. i changed the plugs and they are black now..

thanks for any and all help..
Last edited by marksls1ta; Aug 30, 2006 at 07:48 PM.
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Old Aug 27, 2006 | 08:55 PM
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Find out what the code is. Also, log coolant temp and intake air temp - to see if maybe either of the sensors are bad or unplugged - that will send it way rich.
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Old Aug 28, 2006 | 09:44 PM
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Check your 02 sensor connections, and if not the connection check too see if they are anygood.
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Old Aug 29, 2006 | 05:42 PM
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the scan showed knock and t.p.s sensor and m.a.p sensor
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Old Aug 29, 2006 | 05:43 PM
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Probly a blown engine sensor fuse.
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Old Aug 29, 2006 | 06:28 PM
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just installed a new m.a.p sensor and checked all fuses, still same problems and s.e.s light came back on...

thanks for the help guys...

mark
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Old Aug 30, 2006 | 07:19 PM
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ok got back in it and started it, the a/f meter is 18:1 at idle and the throttle response is very slow.. the a/f is going to 14:1 at about 3500 and then when i let off it is right back to 18:1..

the ses has gone off now..

mark

thanks for the help..
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Old Sep 1, 2006 | 08:17 AM
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t.t.t for the morning
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Old Sep 10, 2006 | 09:54 AM
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ok put a new coolant temp sensor in this morning and no help..
the car has a S.D. tune in it and now if i dont plug the mas air in the car just dies.. then i plug it back in and it will idle but very rough and at 500 rpm.. tune has it set at 975 rpm i think..

so what is wrong with this crazy thing??

thanks, mark
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