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N16 pulsar 1.6 hard to start

Engine very hard to start cold ,seems to be getting excessive fuel ,has good spark,have already replaced coolant temp sensor ,can start by restricting fuel flow from fuel pump .injectors have been tested for leaking down and flow rate injector seals replaced ,there are no signs of any vacume leaks , compression test good. On cranking some times sounds like it has no compression. Any one with any suggestions

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: cold start valve problem

if you have an electric cold start valve make sure to unplug it and if keeps apling fuel with electrical conector unpluged that means the valve is not good, but if not then you have an electronic problem, possible a bad cold start sensor or cold start module or cicuit problem, and might be a time to take it to an electrical shop

Posted on Jun 17, 2008

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csmock132
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SOURCE: 85 xj6 4.2lt. fuel injected, (Problem will not

Does it even try. (cough and sput) Will it start if you spray carb cleaner in it?

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SOURCE: 2001 Galant ES-V6 DTC is P0304 - Cylinder #4 misfire

look for weak valve springs.

Posted on Jun 22, 2009

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SOURCE: mazda protege 96 very hard to start when cold,

check the mas air flow sensor(is this the 6 cyl) the sensor has a problem with the nose piece inside not moving enough to tell the ecm the propper air flow for the cold start,also check throttle valve for dirt build up around it-if its a four cyl repost

Posted on Oct 05, 2009

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SOURCE: i have a 2000 gmc sierra 5.3 with a number 6

I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.

Posted on Jan 10, 2010

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. 1995 disco is a hard start in winter when the temps approach low 30's. Blue gas vapors come out the tailpipe. plugs were changed. runs fine in summer. coolant temp sensor?


I think your engine may have a cold start injector and timer. Check if this is so. Coolant temp sensor acts as a choke and will supply extra fuel when cold, but if you have fuel coming out of exhaust I suspect weak spark= check coil and module, plugs and wires

May 11, 2015 | 1995 Land Rover Discovery

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

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

Hard to start when cold. . . ive herd it runs rich when first staring because of the tbi system. what i herd is the coolent sensor on the left side of the block tell the pcm or pcu to give a hotter spark...


the engine coolant temp sensor tells the PCM to regulate fuel control until the truck warms up and then the O2 sensor then controls the fuel . the computer can't adjust the amount of spark(hotter or colder spark) only the timing. the engine coolant temp sensor will have 2 wires going to it while the temperature sending unit(the one for the gauge) has only 1 wire going to it.YES, if the engine coolant temp sensor is bad and is telling the PCM that the truck is already warm or hot at cold start up then it makes the truck harder to start.

Aug 12, 2011 | 1992 Chevrolet S-10

1 Answer

1996 olds cutlass trouble starting cold. already replaced spark plugs. Could it be the fuel filter?


THE FUEL FILTER WOULD NOT CAUSE THIS, iI WILL ASSUME FOR THIS SOLUTION YOU HAVE SPARK WHREN YOU HAVE THIS HARD START.
Here are the problems that will cause this problem
1. fuel pressure is bleeding off due to a fialed fuel pump check valve, since to check this u need a special test gauge that runs about $40 it is best to have a local shop do this "Fuel pressure leak down test"
2. The ECT sensor (engine coolant temperature) is defective and not giving the proper engine temperature cold, this causes the fuel injection to supply a lean mixture with the resulting hard start, to check this you need a shop to read the ECT with a special live data scan tool to determine if the sensor is within tolerances for the engine temperature reading it provides to the computer.

Oct 19, 2009 | 1996 Oldsmobile Cutlass Supreme Coupe

4 Answers

DOES IT HURT ANYTHING FOR THE THERMASTAT TO STAY IN OPEN MODE


Yes.....The overall purpose of the thermostat is to keep the engine at a specific temperature for combustion purposes.
If the thermostat is open all the time:
1) Engine warm up is slow, heater and defrost function will be delayed and heater out put will be low.
2) Excess fuel consumption, fuel mileage will decrease due to low coolant temperatures.
3) Emissions testing will fail.
4) Excess carbon build up on spark plugs and combustion chamber, engine performance will begin diminish.
5) Moisture will condense on inside of engine crankcase causing oil contamination.
These are just a few things that will be caused by low coolant temperatures. Some will not occur immediately, but left unfixed, will decrease engine and transmission life expectancy.
Hope this helps, you can get by for a short time but it does need to be fixed.
Regards,

Oct 19, 2009 | 2002 Saturn L-Series

2 Answers

My 1985 nissan 300zx 2+2 run crappy when engine is


PROBABLY IS TIME TO DO A TUNEUP SPARK PLUGS AND WIRES

Aug 04, 2009 | 1985 Nissan 300ZX

1 Answer

1997 chevy astro van has poor starting problems after it sits all


hello ralph...check the coolant temp sensor. It acts as a choke to richen fuel mixture when cold. If it doesn't work correctly, hard starting will occur. Once engine reaches operating temp, the problem is usually non-existent. also....
Worn spark plugs.
Fouled spark plugs.
Worn distributor cap and rotor.
Old ignition wires.
Low engine coolant level.
Faulty MAP sensor...any of these will effect cold starting....

Good luck...i hope this helps.

May 17, 2009 | 1997 Chevrolet Astro

1 Answer

Engine won't fire up, bgin to but dies quickly. Plenty of fuel, new battery.


Yes, its the first suspect. Check your distributor cap for corrosion or wipe it with clean dry cloth some is only due to moisture inside it. Next is your spark plug.

Apr 20, 2009 | Nissan Pulsar Cars & Trucks

1 Answer

Starting the engine when cold


Look for the temp sensor around the area where the top coolant hose meets the engine. That should be your thermostat housing (goose neck)....the coolant temp sensor is typically located in or around that component. What octane gas are you using? You may find that operating in the colder temp will require you to run premium in order to avoid excessive starts.

Feb 22, 2009 | 2001 Ford F350 Super Duty SuperCab

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