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2
votes
1answer
30 views

Low beam headlights out, High beam working

The patient is a 1996 Chevrolet Caprice with dual-filament bulbs. Both filaments in both bulbs light up in high beam mode, but no filament on either bulb lights up in low beam mode. What could be ...
2
votes
2answers
286 views

Why did GM change the pressure rating of their coolant tank cap for existing vehicles?

GM has changed the part number for the radiator surge tank cap on vehicles that came from the factory with Dex-Cool. The new cap is 18 PSI (RC87 - part number 25713160), the old one for many vehicles ...
4
votes
1answer
88 views

Can I use an OBD2 Scan Tool on older GM vehicle?

I can get an adapter that connects my OBD2 scan tool to my 12 pin GM scan tool connection. But will the tool be able to read the codes and tell me anything useful? Or do I need to get a scan tool that ...
4
votes
1answer
450 views

Which Reluctor Wheel on LS Engines?

Around 2005 or 2006, GM started using a 58-tooth reluctor wheel, where before they used a 24-tooth wheel in the LSx based engines (LS1, LS2, LS3, etc.). This wheel is used as a way for the computer to ...
3
votes
4answers
412 views

Knocking in my engine during cold start / whistling when accelerating

My 2003 Pontiac Grand Am GT will spudder and the engine will shake occasionally on cold starts. Its not a consistent problem - not every time, but it seems to be growing worse. I can feel the engine ...
1
vote
2answers
54 views

2003 Chevy Corvette actual mileage

A decade ago, a friend showed me how if one shuts down the electrical features of the dash of a 2003 Chevy Corvette, by removing a specific fuse, the car is drivable but the odometer no longer records ...