Question about 1992 Daihatsu Rocky

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90 rocky check engine light on jump connecter no code flashing

Bad ecu ? runs rich

Posted by garret4951 on


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Check the o2 and map sensors

Posted on Nov 12, 2008



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Adjust the air and fuel mixture. I have owned a 91 rocky for 16 plus years.

Posted on Feb 19, 2009


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My holden barina was running rich took it to mechanix he said its the ecu i replaced the ecu and serviced it engine looks stressed then now the whole car is vibrating can you help me with diagnosis

1. I would be very wary of any mechanic that told me the ECU needed replacing because the engine was running rich. I would be getting another opinion. The engine may well have been running rich purely because you had a significant vacuum leak or perhaps even a couple of significantly leaking injectors.
Clearly the guy was hopeless and has done nothing to fix the relatively minor problem you had originally.

2. From what you have said the engine is now misfiring badly (this causes the vibrations) which can be due to a number of different issues. You cannot even begin to diagnose the problem(s) until you hook the appropriate scan tool on the car and see what the engine issues are because the faults will then show up.

3. This is not a problem you can really fix yourself with very limited knowledge and equipment and if I were you I would take my car in to Holden service and have them check it over. If you are not happy with their diagnosis you can go elsewhere for another opinion.

Jan 07, 2016 | Holden Cars & Trucks

1 Answer

What does running rich mean? and is it an expensive fix?

The motor runs on a mixture of fuel and air. If the mixture is wrong it's not running at maximum efficiency and in some cases can be bad for the engine. When there's too much fuel in the mix it's called running rich, too little fuel/or too much air then it's called running lean. There are a few reasons why an engine will be providing a wrong mix so it's best to get it professionally diagnosed, that's cheaper in the long run than a new motor. Most likely to be something simple like a dirty air filter but could be broken injectors or faulty ECU.

Jan 02, 2016 | 1999 Ford Explorer

1 Answer

94 ford mustang 3.8 engine why is no. 5 cylendre running too rich

How do you know #5 is running rich? error codes tell you that? I doubt it. But if you are sure, check the connections and the wire all the way back to the Ecu. my wild guess, the control is shorted to a positive supply and therefore the injector thinks it is supposed to supply wide open fuel. Or you have a bad ecu that is telling it the same thing.

Mar 21, 2015 | 1994 Ford Mustang

1 Answer

After I start the engine it runs fine until it warms up to operating temperature and then runs rough and produces black smoke until t dies. It will not re-start normally until it has cooled.

Bad coolant temp sensor making ECU think engine is still cold, thus running rich, as if choke is on. There are two temp sensors, one for dash gauge (one wire) and one for the ECU (two wires). You can remove it and test with voltmeter by placing unit in hot or cold water to compare readings.

Jan 14, 2015 | Cars & Trucks

1 Answer

97 wrangler 2.5 running rich

this is a MAP , speed density EFI fueling system,,,,
not misfiring.
in no order,
  1. map reads, low all the time cause rich, (low means low vacuum that is real) the ECU sees that and adds huge fueling.
  2. fuel pressure way too high bad PFR.
  3. injector leaking i do an injector leakdown test, or balance test, like the book shows. (and has 3 causes)
  4. front 02 sensors struck lean , forced ECU to go RICH. Any exhaust (its air sucking in) leaks, cause the 02 to go nuts or stick at 0v all the time. and RICH will happen. unplug it , get better?
we use simple tools to find this.
is vacuum at 19 inches HG at idle.? hot? sealevel #s/
???? clean the map yet?

Sep 08, 2012 | 1997 Jeep Wrangler

1 Answer

Car started running a little rough,and burning the fuel at about three times the normal rate. So i changed plugs and wires the car is running even worse real bad and if you give it gas it dies immediatly....

Do not do any mote to the plugs etc. Your Problem and it's solution lie elsewhere. The clue for me was your bad fuel consumption and running rough. Your engine is running too rich all the time which means the ECU is unable to balance the fuel air ratio. You do not state what year or model your car is so my answer is a bit generic but should help point you in the right direction. Also have any diagnostic codes read out at the dealer or Autozone. 1) Coolant temperature sensor - if this is faulty the ECU will assume that the engine is permanently cold (as in start up mode) and set long injection cycles. The engine will permanently run rich under these conditions. Check out the coolant sensor wiring, it's connections and the sensor itself. 2) MAF mass air flow sensor - on most cars this sits on collar immediately after the air cleaner/filter on the air ducting. If this dirty or faulty the ECU may assume that more air is entering the vehicle than there actually is and tries to compensate by injecting more fuel. 3) IAT inlet air temperature sensor - located with the MAF. If this faulty the ECU may cause the engine to run rich. 4) Oxygen sensor(s) - these are located on the exhaust manifold. When an engine reaches normal running temperatures it enters 'closed cycle' operation in which the ECU sets the fuel air mix by the signals it receives about the exhaust composition from the oxygen sensors. If the sensors say there is too much oxygen in the exhaust, due to a fault the ECU assumes that the engine is ruining lean and compensates by injecting more fuel. Note that when an engine is warming up the engine is said to be in 'open cycle' and the coolant sensor signal has priorty over that of that of the oxygen sensor.

Apr 04, 2011 | Chevrolet Beretta Cars & Trucks

1 Answer

Have a 93 stealth r/t twin turbo just had engine rebuilt had been running good for a week then it seems to have lost power and died but looks like it is pushing 14 lbs of boost just sitting getting fuel...

Everytime Ihave come in to a ECU that is failed it is like a light bulb, it either works or doesn't. My first thought is twoards oxygen sensor, these cars will, by design, run rich if an O2 sensor fails. I believe your car has two O2 sensors?

Please let me know,

Dec 08, 2010 | 1993 Dodge Stealth

1 Answer

V40 direct injection gdi . rich running & lumpy idle

replace lambda probe expensive but it will run ok after that, i dont know if you know how they work so here's a brief: lambda tells ecu how rich the exhaust gasses are, ecu ajusts fuel input as neccasery eg lambda says not anough fuel ecu puts more in and the other way round.
so if your lambda is covered in **** when you get it out just clean and put it back, if it looks clean enough it needs replacing!! jezza

Feb 09, 2010 | 2000 Volvo V40

1 Answer

I had the GDI done but still not running properly. splutters, shurges and has a high gas consumption not running too bad on v power

I give a look towards the O2 sensor. When an O2 senor fails the ECU will run the engine rich (better to to this then run lean and burn up valves, in running rich the gas mileage goes bad quick) This condition sounds familiar for O2 sensor failiar.
I hope this may have helped,

Sep 30, 2009 | Mitsubishi Passenger Cars & Trucks

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