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Re: Engine shuts off when a bump is hit!
I am from the UK so im not totally conversant with US vehicles, however in this case i would be looking for an inertia switch. These switches are fitted to cars so that in the event of an accident, the fuel is shut off. Pot holes and rough roads can trigger this by accident, stopping the engine. Look for either a red or black rubber coated button. It could be in behind a little cover near your feet inside the car, or under the bonnet (hood). if you find it, press the centre, you should hear a click. Then try starting the car. Good luck.
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You must have a very loose electrical connection somewhere which is breaking contact every time you hit a decent bump. Have the main electrical cables to the battery checked carefully for condition, make sure the cable connections to the battery terminals are very clean and tight and check all power connections and wiring at the alternator. Then recheck if you are still getting an electrical power loss when you hit a bump.
If you are losing headlights and tail lights etc and getting the alternator warning you should be experiencing a loss of electrical power to the engine(coils, spark plugs and fuel injectors) and engine computer also.
Ignition switch,bad fusible links, coil,ignition module. I have replaced several switches for this problem. At the coil, when you turn the switch on, there should be power. There also should be power when trying to start the engine. If there is no power while cranking, replace the switch. The reason it hits a cylinder or two is that the power goes to the coil, just not enough to get the engine running..
Sounds like the fuel pump has shut off. Can you hear it run when you switch on the key? Your fire comes from the coil pac or the ignitor, whichever you have there, both go bad at any given time. I would pull a plug, check for the spark, then squirt some fuel in the piston, put the plug back in, see if it fires, Did you bump anything, get towed? Hit a curb? Something to trip the fuel shut off. Check the oil while you are at it. Then look for the anti theft device, if it has one, make sure it is OK , Hope this helps.
Wow, this kind of a problem can drive ya nuts. There are 2 different engines for this car, one is a model 4A-FE and the other is a 7A-FE. The problem sounds like a coil breakdown..I know it sounds nuts because it happens when you hit a bump, but it could be coincidental to a coil breaking down when under load. You will need a decent Ohm Meter to do the following. Check the coil primary resistance [4A-FE & 7A-FE both = 1.11 - 1.75 ohms], then check the secondary resistance [4A-FE & 7A-FE both = 9.0 - 15.7 kilohms]. If either of these values is out of spec, the coil will need to be replaced. If everything is OK, next check the air gap between the signal rotor and the pick up coil projection (CAUTION; use a non-ferrous feeler gauge..ie: paper, brass or plastic). For a 4A-FE and a 7A-FE engine it should be .008 - .0016 in. If this air gap is not correct you have to replace the distributor housing. I hope that this helps to find / fix, or eliminate the distributor. If all this is OK check the lead wire from the distributor...it could have a broken wire inside of the plastic cover. If still no luck, write back and we'll try again.
I have had the EXACT same problem with my 03 Chevy Tahoe!!! I have yet to find out the solution!? I cleaned all my grounds and changed my rear speed sensor along with bench tested my alternator! Have you found the problem? I would be very grateful if you could hit me back with an answer!! Thanks
I would lean towards an electrical problem, good possibitly that a harness or connection got loose as you hit that bump. Have you confirmed that the motor is getting fuel and spark? If yes check your computer's harness's as well as any and all electrical connections under the hood.