Why does in run bad when cold as soon as it warms up she purs

A bad plug wire could cause this. Open the hood at night and look to see if any plug wires are shorting. Spray a mist of water on them. May need to put in on a scope to see a bad wire or test with an ohm meter.

Diagnose Engine Misfire - Auto Diagnosis Repair Help

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The engine may shake so badly at idle that it causes vibrations that can be felt in ...The engine may only misfire and run rough when cold but then smooth out as ...

What is causing an intermittent misfire only when engine is ...

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Jun 27, 2013 - NOTE: You MUST restart the engine for the misfire to go away. ... in an expert to do that test, but it might be worth it to prove/disprove the injectors being thecause. 0 ... The first is that the car should run fine even on cold starts.

Engine misfires when cold but runs fine after warming up few ...

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Mar 24, 2009 - They also gave it to me because of this misfire problem it has. ...Engine misfires when cold but runs fine after warming up few minutes later? ... and you start next morning will also cause a misfire until it burns off the coolant.

"Miss/splutter" with cold engine, but fine when warm? M103 / also ...

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Jul 13, 2011 - My moms old 300SEL (with the M103) that was once my car is now my "work car" again as she is getting a brand new SUV very soon.

Cold start misfire solved (finally!) - Bimmerforums

Plugs leads or coils breaking down when warm. Or it could be tight valves when the motor warms everything expands abe if there is not enough clearance in the valves they don't close fully and allow combustion pressure to leak out. To test this do a compression test when hot and cold and compare.

thermostat or low coolant

what vehicle are you talking about? Is it carburetor or injection system fitted? Is it petrol engine or Diesel? Looking forward for your reply so we will be able to help you.

mcdevito75 here Sounds like 1 of the fast or air idle sensors are bad, have your shop run a scan.

while motors warm up the computer supplies information so the motor works well. After it warms up the computer is guided by sensor information. It sounds like a sensor is going bad. Try to get a scanner reading which might show which sensor. The two main imputs to fuel are oxygen sensor and temperature sensor. Real common for O2 sensor to go bad.

Sounds like not all the glow plugs are working.It should run fairly smooth on a cold start if all of the glow plugs are working..Also you shouldn't drive off on a cold start with a diesel,Its really hard on the motors..At least give them 10 to 15 min on a cold start..The oil in them is a really thick oil and when there drove on a cold start theres no oil lubricating the internal parts and will cause the motor to seize up..You may already no this and dont mean you drive it as soon as you start it i just wanted to let you know..When you get alot of white smoke it could be two things,Theres water in the fuel which will make it not have much power die and smoke..But if it runs fine when its warm theres some bad glow plugs...Hope this helps you and have a great day

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

possibly the coolant temperature sensor is faulty

i would recheck the ignition module, sound bad to me. make sure that you test the module when hot