VonRichtofen From Canada, joined Nov 2000, 4644 posts, RR: 35 Posted (13 years 1 month 3 weeks 3 days 15 hours ago) and read 1093 times:
Well I tried posting this on MotorCities.com but it didn't work, but there's quite a few car buffs here so I'll give it a shot:
I own a '91 Ford Ranger XLT with the 4.0L V6 EFI 5 speed manual.
Lately once in awhile my "Check Engine" light will come on for a bit and then go off. What exactly does "Check Engine" mean? Could they be more vague? It's also a yellow light and not a red one. I'm not a mechanic or anything, I know more than the average schmuck about cars but I've never seen a warning light that just says "Check Engine"
My truck is in excellent condition so I doubt it is anything major.
Is this just a "time for a tune-up" warning? Or should I be seriously concerned?
Cfalk From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 1 month 3 weeks 3 days 14 hours ago) and read 1053 times:
The "Check Engine" light is also called the "Idiot Light", which basically says, "we know you are pretty useless, so bring the car to one of our dealers who will charge you $150 per hour to fiddle around with it."
I once had a camaro with such a light. The Catalytic converter was getting old and needed to be replaced, so I replaced it with a straight pipe instead (got better power and better consuption for less money). Of course the idiot light stayed on all the time, because of the different back pressure etc, so I ended up removing the bulb, and the car ran trouble-free for years.
747-600X From United States of America, joined Jan 2000, 2806 posts, RR: 14
Reply 3, posted (13 years 1 month 3 weeks 3 days 14 hours ago) and read 1054 times:
I don't know about cars a decade old, but some newer ones have the light come on for a breif bit if you've gone more than N miles without a tune-up. Mechanics can "reset" the computer so it knows how long to go before giving you another 'hint'.
JetService From United States of America, joined Feb 2000, 4798 posts, RR: 11
Reply 8, posted (13 years 1 month 3 weeks 3 days 10 hours ago) and read 1023 times:
You Ranger has a computer in it. When something is amiss with your engine, the computer is given a code and will store it. Your check engine light simply means it received and stored data. The technician will hook up to your computer and read the codes. This will help tell them what is wrong. Sometimes it may be something vague you cannot detect but still needs attention like a vacuum leak. But they will charge you just to hook up to it.
DesertJets From United States of America, joined Feb 2000, 7839 posts, RR: 15
Reply 10, posted (13 years 1 month 3 weeks 3 days 7 hours ago) and read 1005 times:
If you plan on keeping your truck for a while invest in a Haynes service manual and a code reader for your truck's computer. You can pull down the fault codes and look em up in the service manual. If you do some troubleshooting before you go to your mechanic you will save time and money.
If your vehicle is still under its original factory warranty, which a 91 most certainly isn't, then take it to the dealership.
BTW... on Chrysler products you don't need a code reader. Just cycle it on-off-on-off-on-off and the "check gages" light will flash out the codes.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 11, posted (13 years 1 month 3 weeks 3 days 6 hours ago) and read 994 times:
Vehicles whose powertrains are computer monitored/controlled are fed data by many sensors ie: coolant temp... manifold pressure... oxygen sensor... mass airflow ( where applicable ) ...throttle position... and more. All "check engine" means is that your computer has received an erroneous reading from one or more of those sensors- that is; the parameters of a certain input that the computer is looking for have been exceeded or fall below it. It will issue a code or codes that can be accessed by a diagnostic breakout box of sorts. The cheapo ones at chain auto parts stores may or may not give you the right code- this is why they recommend having a dealer or repair shop see if any stored codes have been set. Some cars have a feature where you can short 2 terminals and turn your key on-off-on-off and on again and the "check engine" light will flash a numeric code ( like morse )
Sophiemaltese From United States of America, joined Feb 2001, 2064 posts, RR: 3
Reply 12, posted (13 years 1 month 3 weeks 2 days 21 hours ago) and read 959 times:
It could mean any number of things. I've heard that in BMWs they are set to come on every so many miles to make you take your car to the dealer to be serviced and that only the dealer can turn it off. Mine has come on in my Audi and I had to take it to a mechanic to have a computer hooked up to it to find out what it meant. It was some emissions crap. It still comes on occasionally and I just ignore it. Check with a mechanic to be sure.