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-99 sts går illa/inte alls


jorgenw

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Det går att tvinga igång den men svårt att hålla tomgång. Verkar gå på endast några cyl.

Detta uppkom vid omkörning helt plötsligt.

Felkod P0101, P0102

Verkar vara nåt som triggar felkod för MAF men kan inte tvinga den till safety mode genom att rycka kabel till MAF.

Var börjar vi titta?

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CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Vevaxel och kamaxel ståndpunkt sensorer är inte kända för att vara problemområden för 1999 års modell, men bilen är 14 år gammal nu. Jag skulle kolla sladdar och kopplingar först. Jag kan leta upp motståndet av cam sensor och veva sensorer i factory shop manual för 1997 årsmodell till men en Ohmmeter läsa ett verkligt värde som inte är en kort eller öppen krets ska vara en bra första kontroll.

Om sensorn är dålig, jag skulle tro om att ersätta både veva sensorer och cam sensor eftersom vad gjorde en av dem gå dåligt, till exempel för mycket salt för länge, kan vara skäl nog att ändra andra.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Do you think the crank shaft sensor can go from ok to fail completely in a snap like this? Or the cam sensor. The wiring to the cam sensor seem to be ok when connecting a voltmeter. The reading I dont remember. Was hard to get a stable reading there when cranking the engine.

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No, the cam and crank sensors usually go slowly or intermittently when they go, and the cam and crankshaft sensors don't usually go bad on the 1999 models. That's why I think looking at the wiring and connectors first is a good idea.

The cam and crank sensors are magnetic pickups, I believe, so the sensors themselves are fine wire coils and a shaped ferrite core. So, a simple resistance check should reveal whether they are open or shorted, or good.

I'll venture that this is a vacuum leak, not a bad sensor. Bad crank or cam sensors will throw a code, with we don't see here.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Excuse me, I re-read this thread and my post is incorrect. Often a bad crankshaft sensor will NOT throw a code.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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