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Re: starting problems at times
The ECU is the computer that, among other things controls electronic fuel injection on your jaguar (great cars). To test the ecu you need equipment that is not normally for sale for home repairers. You need to go to a garage, they will connect a flow meter to your engine and computer machine to your electronic board. Here is something about ECU testing, just for general knowledge information.
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There are MANY factors that will make a car fail to run, the least of which is the ECU. The ECU is plug & play, IF it is the CORRECT ECU! It is VERY rare for the ECU to fail unless the car has been improperly jump-started or has been immersed in water (which will cause even more problems).
Put the original ECU back into the car and check the following:
Is the fuel system working?
Is there spark?
Is the timing belt intact?
You will likely find that the failure is not the ECU.
If the check engine light does NOT come on when cranking, at the times
when it won't start, and the relays are clicking and buzzing, then your ECU is in need of repair. The engine will
only start after the check engine light comes on and the ecu is what
controls that. ECU is likely going bad, causing the delayed start problem
typical of early 90's jeeps. Reasonably priced repair or replacement services for your
jeep ECU are available on ebay.
The first years of that body shape, like the 93 Grand Cherokee, had ecu computer problems. Next time it won't start, check to see if the check engine light does lights up on the dash, when you turn the ignition on, before cranking. If it does not, the fuel pump will not kick on, until that check engine light does come on. It's referred to as the delayed check engine light problem, on early to mid 90's Jeeps. If you find out that is indeed the problem, you can have the ecu computer repaired.
There are a number of drive cycles that the car needs to go though before the ECU will set itself up correctly. This should happen over time but sometimes it's worth following the drive cycle requirements to speed things along. Check out http://www.bluejag.co.uk for details on engine drive cycles/
No there isn`t and if you try to ground the wrong wires it will blow the ECU,Any Eobd code reader can clear most codes in the engine management butforother systems you need Dedicated IDS jaguar software.
When you get this kind of problems, you always start replacing plugs, and eventually air filter and fuel filter if they are dirty. Once you exclude this simple causes, usually is either an injectors problem, or an ECU problem. ECU is the computer that controls electronic injection and often is cause for the problem. YOu cannot test or fix the ECU at home, it must be connected to a machine that controls computer and check fuel flow at the same time, you need to do this in a garage. Start doing the simple things, and eventually go to a mechanic if problem keeps going.
This could come from your ECU, your gas line or who knows what. There are so many parts in jags its almost impossible to find the exact problem, which is why the **** at Jag have to decided to completely replace things instead of trying to fix them. Good Luck.