I have a Pontiac Montana 1999 mini van with just 55000 on it, Everything was perfect until I changed the spark plugs (6), and started the engine the check engine soon light started flashing, what possibly can be wrong.
2007-05-21 04:42:45 · 8 answers · asked by RRRR 1 in Cars & Transportation ➔ Car Makes ➔ Pontiac
missfires causes a flash. that ruins the cat. take to dealer to have fixed quick
2007-05-21 04:48:37 · answer #1 · answered by Anonymous · 0⤊ 1⤋
a flashing service engine soon light means that a engine misfire that is severe enough to cause damage to the cat. convertor is happening. Having work on that type of vehicle often, I would say that, 1. a wire is broken or not all the way on, 2 a pair of wire switched around or 3. A broken spark plug. Also if you look in you owners manuel spark plugs have a life of 100,000 miles.
2007-05-23 17:02:20 · answer #2 · answered by chuck f 2 · 1⤊ 0⤋
There are 2 conditions that will cause this to happen.
1) The spark plug wires are not completely seated on the plugs. Check and resecure each one. Also check continuity on the wires. You man have damaged or pulled the wires apart from the connector upon removal.
2) using Bosch plugs will cause this problem. You are almost always tied into using AC Delco on this particular vehicle.
2007-05-21 04:56:55 · answer #3 · answered by Lemar J 6 · 3⤊ 0⤋
Make sure the spark plug wires are securely. Did you check the spark plug gap before installing them? They usually don't have the correct gap when you buy them. An incorrect gap, or a loose wire, can cause the engine to misfire, and this will cause the light to go on.
Good luck!
2007-05-21 04:49:18 · answer #4 · answered by Me 6 · 3⤊ 0⤋
FLASHING??
That means there is something terribly wrong with the engine and some type of failure is about to happen.
You probably got a couple wires hooked up to the wrong spark plugs, and the computer is confused.
2007-05-21 04:47:06 · answer #5 · answered by Mr. KnowItAll 7 · 2⤊ 0⤋
Replace the gas cap. It may be bad, even without any visible indications. You mention the SES light comes on, so a code should be set in the computer. This car has a 36,000 mile warranty. If you're under that, beat the dealer up until he fixes it. If not, see if you can borrow a gas cap to see if resolves the problem.
2016-05-18 22:55:37 · answer #6 · answered by ? 3 · 0⤊ 0⤋
Most likely you need an O2 sensor, I had the same issue, and I went crazy. An O2 sensor will run anywhere from 26.99 to 52.99(labor not included) Good Luck.
2007-05-23 05:22:47 · answer #7 · answered by chantell_hanna_2006 2 · 0⤊ 0⤋
Engine is missing,and unburned fuel is entering cat converter ,light is letting you know its to rich and the cat conv is going to be damaged soon if problem is not corrected.
2007-05-25 01:50:36 · answer #8 · answered by deltech 4 · 0⤊ 0⤋