hello --- My tach "jumps" I don't know why the car is in park it is 60F - 60F in my garage all the time can this have something to do with the throttle body or oxygen sensor ?? This is a 1992 4.9 Seville.
A fuel rail brings fuel to multiple injectors, which actually squirt the fuel into the engine. On the 4.9, there are 2 fuel rails, each serves 4 injectors.
If you tach is jumping, but the engine is running smooth, you may have a weak battery (improbable), a bad voltage regulator in the alternator circuit (check the battery voltage in park to see if it's too high, i.e. above 15.5 volts), or possibly, a corroded electrical ground that is causing spiking voltage. Either way, I'd get it fixed quickly, otherwise you could burn out the computer and the IP cluster among other things if it is a voltage issue.
i have a 4.9 but need to know if putting the intake off the 4.1 and placing it on the 4.9 is better. or swapping in the new wire harness wire harness or if is not going to make much of a differnce not planning on keeping the car i have been asked to do this job
My 91 Deville (140Kmiles) just started to miss after being driven on the freeway in Phoenix when it was 113F outside. When engine had cooled off and temp was lower, it ran fine. Is there ignition components that bread down in the heat? Will be changing the fuel filter to see if that may be...
Good after noon cadillackers. I have a qustion that's racking my brain. I own a 87 cadillac deville short body 4.9 v8. The problem I'm having is my car is currently at a shop for three issues
1. Rear breaks are locked from sitting
2.water pump is shot
As of now the shop informs me...
I have an 85 Eldorado and will be pulling the motor in a few weeks and having it rebuilt. I plan on replacing the radiator, water pump, etc after I get it back.
Do I need to use the coolant tablets ?
my deville has seemingly given out on me. it started one day when i was running errands and had to get some gas. i normally put chevron in my tank but a shell was close by and was more convenient so i got gas there. then all the problems start. my car ran fine for about 20 minutes then started...