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Hard starting, rough idle when cold, then smooth running when warm

Hard to start. gets worse every day. Finally starts and runs rough. Have to keep giving gas. Finally smooths out when car starts to warm up. Seems like a probIem with choke cold start.

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  • 98 Answers

Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

Posted on Nov 28, 2012

  • 2 more comments 
  • Kevin Powell Nov 29, 2012

    1996 Ford Escort 1.9L. New plugs and wires about 1 year ago. New head put on when timing belt went last year. New lugs and wires. I already rule out tune up because after car warms up, it runs smooth. I'm thinking something that controls choke???

  • Kevin Powell Nov 29, 2012

    Sorry...New PLUGS and wires, not LUGS.

  • Kevin Powell Nov 29, 2012

    Also..Drive belt recently went. Installed new belt. Belt light flashes once in a while. Also, just installed new battery.

  • Ty St Nov 29, 2012

    There is no choke. It's a fuel injected system. I would still check the plugs. Belt light...?

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Posted on Jan 02, 2017

fischmilch
  • 96 Answers

SOURCE: 99 Saturn SC1 ''Service engine soon'' light is on.

Did you get the code that triggered the SEL? If you know that, it will be easier to diagnose your problem. You can do it without a tool on the old saturns. Just need a paperclip. :

Use a paper clip to jumper Terminal A and B of the ALDL *Assembly Line Diagnostic Link* which is above your left knee.
Terminal A is an interal ground and is the top right terminal in the connector. Terminal B is directly adjacent and to the left of Terminal A.

Turn the ignition to ON.

All codes are 2 digits between 11 and 99. Codes are displayed on the SES light by flashing the light with short and long pauses to distinguish digits of one code from digits of another. The short pause is used between digits of the same code, long pauses are between codes. Also, each code is flashed three times before going to the next code.

For example, the sequence of code 12 will be: flash, pause, flash-flash, long pause, then repeat 2 times. If Code 12 is not displayed, the self-diagnostic pogram i snot functioning properly.

If only Code 12 is displayed, no system malfunctions have been stored.

Any existing system fault codes are displayed in order from low to high, except for Code 11.

On vehicles with an automatic transaxle and on which exist stored transaxle codes, Code 11 will be displayed last, then the SHIFT TO D2 light will begin flashing transaxle codes of flags.

When all engine codes have been displayed, Code 12 will flash again.

Diagnostic Codes
11. Transaxle Codes present
12. Diagnostic System Check
13. Oxygen sensor, circuit open or not ready
14. CTS circuit, out of range high
15. CTS circuit, out of range low
17. PCM fault, pullup resistor
19. 6x signal fault, no 6x signal between reference pulses
21. TPS circuit, out of range high
22. TPS circuit, out of range low
23. ATS circuit, out range low
24. VSS circuit, no signal
25. ATS circuit, out or range high
26. Quad Driver output fault
32. EGR system fault
33. MAP sensor circuit, out of range high
34. MAP sensor circuit, out of range low
35. IAC valve, rpm out of range
41A EST circuit open
41B EST circuit shorted
42A Bypass circuit grounded
42B Bypass circuit open
42C Bypass circuit shorted
41. EST bypass, open or shorted
42. EST bypass, open or shorted
43. ECS (knock sensor) circuit open or shorted
44. Oxygen sensor indicates system lean
45. Oxygen sensor indicates system rich
46. Power steering pressure switch circuit, open
49. Idle rpm out of limit high (vacuum leak)
51. PCM memory error
55. A/D converter error in PCM
81. ABS message fault (1993 vehicles with TCS)
82 PCM internal communication fault


Diagnostic Flags
27. Quick quad driver output fault (1993 only)
48. Reference imput intermittent or noisy
52. Battery voltage out of range
53. ESC knock present
54. Five volt reference ground
58. Battery voltage unstable
61. 6x signal fault
63. Option check sum error
67. Handwheel sensor circuit fault
71. Cooling system temperature high
72. Coolinng system temeprature low
73. CTS sensor unstable
74. CTS/transaxle temperatuer sensor ratio error
76. ATS sensor unstable
83. Low coolant (1993 only)

Posted on Mar 27, 2009

  • 113 Answers

SOURCE: 2000 catera cold start idles rough and dies. After

Did you have battery disconnected or dead recently?

Try to place ignition in run without starting engine for 3 minutes (shut off all accessories and lights etc..). Then shut it off and then start it. Should relearn the idle.

If this doesn't fix the problem, unplug the MAF sensor, if it runs fine with it unplugged, its the MAF sensor.

Exactly what happened on my wife's 01'.

Posted on Jul 25, 2010

csmock132
  • 4669 Answers

SOURCE: 93' 4.3 chev runs rough at times

Have someone turn the key on while you watch the injectors. If any gas leaks out of the injectors, without cranking on it) replace the o'rings around the injectors.

Posted on Mar 12, 2009

rockitman187
  • 2559 Answers

SOURCE: Dodge ram rough cold start idle

Change the EGR valve.

Posted on May 05, 2009

  • 462 Answers

SOURCE: cold start bog rough idle warms up runs smooth no trouble code

CHECK THE INTAKE MANIFOLD GASKETS FOR VACUUM LEAKS AROUND THE TOP AND UNDER THE PLENUM.

Posted on Jul 11, 2009

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1 Answer

99 ford ranger, idles rough till it warms up,then runs good. Hard to start after it gets hot, it acts as if it is starved for fuel. Once it does crank it runs fine.


First thought: Check the idle air control valve, or whatever its Ford equivalent is. Sometimes these start to stick and cause the rough early idle that smooths out later.

Oct 17, 2013 | Cars & Trucks

1 Answer

99 contour starts easy idles smooth, cold but dies when you start to pull out runs well when warm


Its cold start issues:----

Go through the list of help links mentioned below:----


Click the link :----


Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

----------

Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Ford explorer 4.0 will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

--------

Automatic transmission shift lever hard to move on cold mornings?

http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

-----------

These will help.

Thanks.

Dec 06, 2012 | 1999 Ford Contour

1 Answer

Hard starting and rough idle


The idle valve is the most common problem for hard starting in cold weather. I would recommend having it removed and inspected for contamination. Sometimes they can be cleaned out. If it has heavy carbon buildup, you may have to replace it. (if the idle valve is removed, the shutter inside should easily move when you rotate it from side to side and you can also look at it with a flashlight for a visual inspection.

Feb 20, 2012 | 1997 BMW 328

1 Answer

At first the truck idles extremely rough when cold cranked. This went on for a couple of days, now the truck will not start at all. It hits every once in a while while repeated cranking on cold start. ...


Sometimes on cold days if the cranking amps on the battery are low, then it will be hard for the vehicle to start. Also, check the oil level. If the level is low it will create a hard start and rough idle for the vehicle.

Nov 27, 2010 | Ford F-250 Cars & Trucks

1 Answer

89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.


Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Dec 06, 2009 | 1989 Dodge Shadow

1 Answer

1988 Ford Taurus hard start problem


Change the coolant sensor located close to the thermostat housing. This is easy but do not over tighten it. You will have the same problem if you do. Tighten till it does not leak only.Good luck!

Nov 25, 2009 | 1988 Ford Taurus

1 Answer

Rough idel when cold start


if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change it!

Mar 26, 2009 | 1993 GMC Safari

1 Answer

Hard start and rough idle.


Sounds like it's time for a tune up of the ignition system. That would be easiest. If not, have a mechanic check your cylinder compression.

Feb 26, 2009 | 2000 Chevrolet Silverado

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