lumina problems

[1995lumina]

I have a few question about my 1995 chevy lumina it has 190,000 miles nothings been change on it be sides oil changes, tune ups ,transmission oil and breaks. nothing else. my 1st question when its cold out you can here the water pump make a scraping noise and also when the motor is cold it makes a ticking noise i was wondering what was wrong with that and if it was the some thing or two different things. next when i am on the highway going 45 to 50 the car jumps but after that it stops but in the drive that saves gas on the high ways it really jumps and when you take you foot off the gas the car jumps to and the service engine soon light comes on but when yuo shut the car of the light goes of until u drive 40 and drop speed . last when i put my foot on the gas like all the way down takein off from a stop light some times the car cuts out so i was wondering what was wrong . please help

[Blue Bowtie]

Welcome Aboard!

There are many possible reasons for ticking when cold, including piston slap, dry lifters, low oil pressure, and others.

If the water pump is making noise, repair or replace it. Just make sure the problem is the water pump, since the air conditioner compressor clutch is also notorious for making a "scraping noise" when the A/C is off.

As for the "jumping" at highway speeds, it sounds like there may be an issue with the torque converter clutch and/or transmission, but scanning the PCM to read the error codes might be the fastest and easiest way to solve the problem.

[1995lumina]

well it really jerks going up hills the same thing it does goin 45 to 50 and 55 to 60and when goin up hills it wont go no faster then 45. and how do u tell if ur oil pressure is low?

[Bearwulf]

check fuel filter & pressure, & air filter first for lack of power.

[1995lumina]

i have change the fuel fliter and air fliter and i have put the fuel injection clean in the gas tank. it didnt start jerking until it was given a tune up and had the transsminssion oil changed.