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My toyota starts hard and runs rough till warm

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  • Cars & Trucks Master
  • 5,763 Answers

What year,make and model? this may be caused by a bad sparkplug or coil pack, depending on the year, the older toyotas use spark plug wires and cap and rotor with a distributor.

Posted on Jan 23, 2013

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Rough idle until warm 22r

if it is a carburated engine it is probably the a.a.p. diaphragm in the carb. if you remove the air cleaner and look on the side of the carb that is towards the valve cover near the front yow will see a vacuum hose going to a cover that is fastened with 3 screws. if you pull the vacuum line off you will see that there is probably fuel being sucked into the line due to the leaking diaphragm. the vacuum source is temp controlled and cuts off when warm. but when cold sucks fuel directly into the intake. remove the 3 screws to replace the diaphragm, being carefull of the spring. good luck!

Posted on Dec 18, 2008

  • 2 Answers

SOURCE: 99 Blazer, 4.3L, hard to start, runs rough when

give her a tune up, an oil flush and change... lube her up and off ya go...

Posted on Jul 13, 2009

Molson02536
  • 3854 Answers

SOURCE: Idles rough and is hard to start apears to run better after it warms up. Have replaced the ICO, TPS, and the map sensors with no effect.

You can clean the EGR. No promise it will work. I have an idle problem on my `97 Grand Am Se. Shop told me I could clean it and it might solve my problem. 
Just remove the EGR with the 2 bolts from the top of the manifold behind the throttle body if you have a 3.4 v6 like I do. Then leave it upside down with throttle body cleaner in it. Fill the EGR level with cleaner and let it soak for at least 30 min or more. Then reinstall. 
This will remove any carbon on the inside which plugs the needle from pushing out at highway speeds. Hope this helps. If the problem returns in a week or so then replace with new EGR. New EGR is about $100-200! Cleaning seems to have helped my car did that about 3 weeks ago.
If you have a service engine light on turn the key to the run position on the ignition, pull the fuse to the ECM (batt) and disconnect the wire harness to the EGR. Reinstall it after a 1 min, That will clear all the codes in the ECM and reset everything.
Once you place the ECM fuse back in, start the car. It may stall but let it, DO NOT TOUCH ANY THING. The ECM need to relearn the EGR and engine from all it's sensors like the first time it was started. Just start it up again and it should be like the day it came off the assembly line and will relearn everything.
Good luck and just drive it like you always. If you decide to change the EGR valve, you still need to clear the ECM as mentioned above for the ECM to relearn the new EGR valve. Hope this helps and keep me posted.

Posted on May 25, 2009

  • 14036 Answers

SOURCE: My 1983 toyota pickup runs rough and black soot come from exhaust

carb automatic choke sticking closed or your float setting too high causing flooding engine.

Posted on Nov 19, 2009

SOURCE: 2004 F350 6.0L starts rough and runs rough until

What tells me, is that the thermostat is staying open after
your done using the truck
When you start it up cold, it takes longer to warm up the area
near the coolant temp sensor,which is part of the system
to put the PCM (computer) into closed loop
Closed loop is when you leave a computer fuel stratagy and
the O2 Sensors take over fuel control

Hard to start----

Need spark plugs that have not been in the motor over 60,000 miles
Spray the throttle plate with CRC Throttle Cleaner
Spray the MAF Sensor with CRC MAF Cleaner
Need all ducting in place,no vacuum leaks and a clean air filter
Make sure your O2 Sensors are tight
A fuel filter not over 3 years old
Hope the coolant temp sensors works correctly

Anything more gets too technical

Posted on Dec 02, 2010

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Good luck.

Rate this please.

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Cold blooded


Hello
Welcome to FY
very common problem on the 318/360 is the egr port becomes plugged up this will cause a poor start and run rough until warm up.
RD

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