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Starts good when engin is cold, but not when engin is how

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1 Answer

Won't start unless engine cold


You'll need to figure out if you are loosing spark or fuel when it fails to start up to know which system to test.

Jul 27, 2014 | 2003 Pontiac Grand Am

1 Answer

1989 tracker. hard to start when cold but starts fine when warm.


89 has the old stand alone spark distributor.
the ECU is spark free, (no player here)
so here is the list for this engine 1.3 or 1.6L
the 1.3 has a carb. (last one) and is NOT EFI ,
you never said which engine it has. so ill guess at the 1.6L
This engine will have hard starting for the fooling reasons.
we dont guess at it we just do the tests.
  • Bad fuel.
  • Never tunedup this decade or every 60,000 miles per opr. guide.
  • low engine compression 150 good, if all are very low the cam timing belt slipped., (they all do , ignored) and is 60k service point.
  • CEL dead key on, bad ECU or lamp bad.
  • CEL glowing running, its telling you what is wrong, get the flash codes (DTC's)
  • Too high fuel pressure. (bad regulator in front of TB)
  • ECT bad. the 2 pin engine coolant temp sensor is bad. test it.
  • The injector leaks in the throttle body (look with eyes)
  • You find that adding 5-10% throttle cranking makes it more easy that is a bad, IAC valve, the valve at the base of the throttle body is stuck closed and kills all cold start air supply. making cold starts very hard, unless tricked with right foot. yes?
  • when any gas engine fails to start cold, i check for too much or too little starting fuel. and for very good spark.
  • Good engine, good spark the good fueling, there are tests for each, ASK?

Nov 23, 2013 | 1989 Geo Tracker

1 Answer

Cold start injection


It is a separate injector on a timer switch that is used for starting a cold engine. A cold engine needs more gas for good driveability.
I think it would be located on the intake manifold, but not positive on your Hyundai.

Jun 27, 2013 | 2001 Hyundai Elantra

1 Answer

Why will a vehicle not crank sometimes in the morning?


faulty engine coolant temperature sensor cause no cold start problems.but make sure engine has good spark plugs and wires.clean fuel injectors and new fuel filter.during cold start up or morning start up engine need rich fuel mixture good spark to start.

Jun 21, 2013 | GMC Jimmy Cars & Trucks

1 Answer

81 Firebird won't start. Getting spark to plugs. Just will not start New Engine put in.


i use over haul carburetors.if idle speed screw too low engine wont start.if engine cold automatic choke need to be closed slowly open as engine warm up.if engine cold automatic choke need adjusting or fixed or if choke remain closed when engine hot vechicle will not start most time automatic thermostatic spring goes bad causing choke problems.

Jan 25, 2013 | Cars & Trucks

1 Answer

Lexus LS400 cranks but will not stars


CHECK FOR SPARK AND FUEL.IF ALL IS GOOD A BAD COLD START VALVE WILL CAUSE COLD ENGINE START UP PROBLEMS COLD START VALVE DOES SAME JOB AS ENGINE COOLANT TEMPERATURE SENSOR IT ENRICHEN FUEL SYSTEM FOR COLD START UPS. DO LITTLE TUNE UP MAKE SURE SPARK PLUGS AND WIRES GOOD, REPLACE DISTRIBUTOR CAP AND ROTOR,CHECK IGNITION TIMING, REPLACE AIR FILTER AND FUEL FILTER. IF CAR GETTING FUEL AND SPARK.CAR TIMING BELT COULD HAVE JUMP TIMING IF TIMING BELT NEVER BEEN SERVICED OR REPLACED.

Oct 24, 2011 | 1993 Lexus Ls 400

1 Answer

Only when engines cold it take 6-15 time to start. whats wrong?


check for any problem codes. it needs more fuel to start in cold weather! if need be check fuel pressure and be sure fuel filter is not plugging up. and battery is good for cold cranking amps. have a good day!! if fuel is getting to engine, then check the fuel pressure regulator.

Oct 18, 2010 | 1996 GMC Sierra

2 Answers

Starts good on a cold start. As it warms up, it


Sounds like the automatic choke is sticking.

Feb 25, 2010 | 1989 Cadillac Sedan DeVille

2 Answers

Car will not start when cold - otherwsie runs perfectly - put in new spark plus still does not help


It is not starting when cold since the cold start valve is not functioning. 1-It could be a coolant temperature sensor gives a wrong resistance readings when it cold so ECM doesn't know to send a signal to turn on the cold start valve. 2- It could be a bad cold start valve. I doesn't open even the ECM send a signal to it to open. You can see that Ohm reading on the terminals of the cold start valve is good, but it is still bad since your measuring the coil to open a valve showing the coil is good but valve gets stuck could not be opened. Good luck in checking these out for a good replacement..

Nov 14, 2009 | 2005 Subaru Forester

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