Question about Cars & Trucks
Hi Mary, You have not told us the vehicle make or model, or basically anything we can use to determine what fault it may have. Take your vehicle to a reputable garage and ask them to carry out a diagnostic scan. Regards John
Posted on Dec 01, 2012
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Posted on Jan 02, 2017
As you may know, modern automobiles (from the 1980's to present) have at least one computer controlling them. This computer (or computers) control the fuel to air mixture via either electronic fuel injection or a feedback carburetor. On the newer vehicles the computer also controls the ignition timing (That's when the spark plugs fire).
The newer a vehicle is,the more stuff the computer(s) control. The newest vehicles have the computer shifting the automatic transmission or transaxle as well as controlling spark and fuel mix. Many vehicles also have a climate control computer which controls the A/C and heat. Luxury cars often have vehicle anti-theft controlled by computer: some even will adjust the seat and steering wheel to suit different drivers when they enter the car!!!
The downside to all this "smarts" on a car is obvious: what happens when something breaks? The good thing is that the onboard computers themselves are very reliable. The problem is that the computers rely on a whole flock of sensors and wires to give them the data needed to make your car run. These sensors are not nearly as reliable as the computer itself, in fact they fail quite often!
This is where a "limp home mode" comes into play. Whenever the vehicle computer gets a reading from a sensor that is obviously wrong, it will "assume" a value that it "knows will work". On the earliest computer controlled cars with feedback carburetors, if the computer got bad readings from sensors, it would run the carb at the richest setting. You would get horrible gas mileage, but the car WOULD run. The computer would then turn on an amber "CHECK ENGINE" light. It would also store a trouble code in its memory telling what sensor was giving a "bogus" reading.
The newer computers are much more sophisticated, and just because a "CHECK ENGINE" light comes on doesn't really mean the computer is totally in a "limp home mode". Depending on what sensor reading is out of specs the computer may still be doing a pretty good job of controlling the engine. For example, some cars can have the "CHECK ENGINE" light come on if you don't tighten your gas cap tight enough after filling up!
On most vehicles the "CHECK ENGINE" light will go out if the sensor starts giving normal readings again, although some computers will make you use a scan tool to turn the light off.
This basically looks like the sensor to me, try getting that fixed for good.
Kindly let us know for any future assistance.
Posted on Jul 09, 2009
the car has the capablilites to give data and codes. You gunna need a professional if you dont have access to a scanner and multimeter. Otherwise were just guessing.
I hate telling people that its out of their hands but sometimes its best to let the pro diag it and then you can repair it if you capable
Posted on Nov 26, 2009
Based on the information you have provided your problem is one of two things
1.Bad fuel pump -to check this have the fuel pressure tested if above 40psi you should be able to start the vehicle. (you can borrow/rent a fuel pressure tester at an auto parts store)
2.Bad crank and cam sensors -these are what tell the injectors to fire, so if you have good fuel pressure to the injectors but still no start I would replace both the crank and cam sensors.
Posted on Jan 27, 2010
PO456 is most times a gas cap or gasket,
to get an incorrect gear ratio the transmission has probably started to slip.
Change the fluid and filter first off in the transmission and use only atf+4 fluid and possibly the govenor pressure sensor,and change gas cap.
Posted on Jun 03, 2010
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