I have a 99 Malibu, just put a used motor in it(about 35 k miles) and its sputtering at 40-60 mph. Does it worse when you use cruise control. What could be the problem, new spark plugs on it about a month ago. Thanks
2007-03-17 12:04:24 · 6 answers · asked by daddyzgrl4u05 2 in Cars & Transportation ➔ Maintenance & Repairs
The temp gauge stuck and my car ran hot and it blew the old engine.
2007-03-17 12:58:46 · update #1
vacuum leak
2007-03-17 12:10:11 · answer #1 · answered by geezerrex 5 · 0⤊ 0⤋
I would start bye checking the timing, then go to fuel filter, fuel injectors. Assuming the check engine lite is off. Could be the following but the check engine light comes on in most cases throttle position sensor, vacuum leak. If its getting hot its probly either the catalytic converter or timing will also make it run hot.
2007-03-17 19:20:48 · answer #2 · answered by Donny 1 · 0⤊ 0⤋
What was the old motor doing? If it was running very rich then you may have clogged up the old catalytic converter. You can disconnect the converter and drive it again. If the performance improves, then you found the problem......
good luck
2007-03-17 19:39:50 · answer #3 · answered by mailbox1024 7 · 0⤊ 0⤋
Check the fuel injector, This is probably the problem but timing possibly maybe off, maybe catalytic converter too.
2007-03-17 19:07:33 · answer #4 · answered by krazyinchicago 4 · 0⤊ 0⤋
sounds like fuel problems.check the gas filter and run a test on the fuel pump.
2007-03-17 21:34:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
check the throttle position sensor
2007-03-17 19:07:59 · answer #6 · answered by hillbilly 2 · 0⤊ 0⤋