Question edited for clarity.
Question moved to model category.
Did you clear the code with a Scan Tool after replacing the valves?
The 1998-2001 Chevrolet Tahoe has a known issue with the air pump check valve which causes illumination of the check engine light. There are no notable symptoms, but the vehicle will not pass state inspection or smog testing. When the valve fails, it sticks closed, and the computer sets the code P1416.Dec 10, 2016
Incorrect Crankshaft position and valve timing.
It has an interference engine, so the piston came up and hit the valves and jammed with piston. You now have bent valves.
Hello, although from your brief description of fault May I offer assistance? Not on a Chevrolet but a Volvo 740, the Button on the steering wheel for the horn are Copper semi circular type and sprung loaded. Me being ham fisted with annoyance pushed the button too hard, it worked ok at the time of use but a few minutes later World WAR 3! had to pull plug on horns themselves to silence them.
So FixYa resolution? Check Horn button itself Cuz it'll be stuck!
Cheer's
Paul 'W'
Onyer~EDson(:0)~[><
I had this problem, and to be honest, it happened to the left side about a week later...it's the board that the bulbs plug into...it's a very common problem with this model. So popular that you can normally get the socket board off the shelf at a parts store! it's extremely simple to replace, and I replaced all the bulbs at the same time!
Try having the dealer flush and bleed your system. It is very hard to bleed ABS systems yourself and have safe brakes that still work afterward. Bleeding non-ABS brakes yourself is easy not the same for ABS brakes. Valving, sensors and what-not require a tech and the correct equipment in my opinion. You do it wrong and you could ruin your ABS system. Do that and see if they firm up. I replaced my brake shoes/pads at the same time all new everything in back, drums/springs everything and new rotors up front. then I had the chevy dealer flush, refill and bleed system. Stiffer pedal and brakes work better. Keep in mind the brakes on 99 Tahoes are inaedequate, require new rotors often, heat up and fade/glaze pads regularly. I replace my pads long before they wear down because they glaze up and start fading early. I'll rough em up once maybe, next time, new ones. Every two brake jobs, new rotors for me. Just how it is. They will stiffen a bit and work better but they will never be awesome brakes. Just how it is on 99 and earlier Tahoes. Hope it helps. Very important to bleed correctly though. I'll bleed my 83 Toyota 4x4 myself but not the Tahoe.
If the bulbs are lighting but not flashing it is probably the flasher unit relay or a faulty signal switch. Have you checked to see if they flash using the Hazard light switch? Relays are usually a cheap part so try replacing it.
Eng 1 fuse 20 amp feeds battery voltage to the camshaft position sensor . It's possible you have a shorted cam sensor . Don't pull engine 1 fuse . but instead disconnect the cam sensor .
I never had this problem with my truck but it sounds like it could be a bad connection signal from the new switch and the computer box that's causing the security light to flash. I know that switch has to be connecting properly in the steering column or it can give off a bad signal. it could also be a bad new switch
I think that fuel pressure may be too high - the injectors work over a vary narrow pressure range. The regulator output may be blocked, or the pressure may just be too high for the injectors. I would start by replacing the regulator.
You could have a plug wire periodically leaking voltage to ground if the wiring is not properly installed, or a problem with your distributor/rotor, but could also be caused by many other sensors (such as a faulty crankshaft sensor) or problems with your fuel system (filter, regulator, etc.).
I would check these plug wires carefully for contact with the engine and good connections at the distributor/plugs, and also add a good quality fuel system cleaner (gas tank additive) before going on with troubleshooting.
