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Replaced the leaking vacuum line and four ignition coils and it seemed to help some. The Tahoe will suddenly start the rough idling and I was able to check the fuel pressure and it was 60psi.

Do I relace the fuel regulator next or what is the best move

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Fuel pressure at 60psi means the fuel system is good
could be problem injectors ( blocking up or wiring problems ) so have them serviced

Posted on Dec 14, 2016

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Rough idle, parts store said emissions. what needs checked?


Vacuum lines. And check for residue buildup preventing throttle body from closing .

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Engine runs rough and gets worse when accellerating


PROBLEM TROUBLE AREA
Rough idle, stalls or
hesitate on acceleration :
.Spark plug faulty
. High-tension cords faulty
Ignition problems:
• Ignition coil
• Igniter
• Distributor
. Incorrect ignition timing
Vacuum leaks:
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. EGR line..
. Intake manifold.
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Dec 12, 2013 | 1989 Toyota Camry

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01 toyota avalon with codes PO300-306 car runs rough and idles rough now while driving it start loosing power and making a snake rattling sound


Is the rattling sound coming from the exhaust? I'm wondering if perhaps you have a loose catalytic converter. P0300 (multiple cylinder misfires) and P0306 (cylinder #6 misfire detected) are probably the cause as to why the car is sluggish, shakes, runs rough and lacks power. Make sure to take a close look at your ignition system (spark plugs, ignition wires, coils...). A spray bottle filled with soapy water can help you find voltage leaks on the wires and coils. Just spray the wires and coils and look for arcing. Replace any component that arcs. Other causes can be fuel injectors, vacuum leaks...).

Mar 03, 2013 | 2001 Toyota Avalon

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1995 chevy tahoe 4wd. 5.7 liter when cooled down, starting is normal . Right after, engine almost stalls but Idle air control kicks in and keeps it running. eventually it is idling but rouph. On...


If your vehicle has one, and I think it does, check your EGR system. If the egr valve is full of carbon, it can be partially open, creating a vacuum leak. If the egr valve solenoid is bad, it could be opening the valve at the wrong time, also creating a vacuum leak. Unplug the egr vacuum hose, plug the open end of the hose and start it and see what it does. A picture of the egr is below.
3_11_2017_5_29_14_am.jpg

Mar 11, 2017 | 1995 Chevrolet Tahoe

1 Answer

Really rough engine idle at cold start up,, reving the engine seems to smooth it out,,,,


Some causes about rought idle could be:
- Valve adjustment
- Incorrect ignition timing,
- Vacuum leaks
- Bad ignition wires (Test w/ ohmmeter)
- Incorrect idle speed
- Cold Start Injector always "ON" (Revised injector time switch avail.)

A source of rough idle in EFI engines is air leaks or vacum leaks these leaks will upset the fuel mixture without triggering any codes. A bad oxigen sensor will also cause a rough idle, but you should see a code for it ( I think is number 5, but check it).

A good place to start would be an inspection of the spark plugs, plug wires, ignition timing, and idle speed. Next would be valve adjustment. Don't overlook the simple things.

Hope this helps, keep us updated and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Nov 04, 2011 | 1997 Honda Accord

1 Answer

REPLACED COIL PAC RUNS ROUGH


ROUGH IDLING CAN BE CAUSED BY VACUUM LEAKS.LIKE THE INTAKE MANIFOLD GASKET.OR VACUUM LEAKS FROM HOSES.LOW COMPRESSION CYLINDERS WITH BAD VALVES.LEAKING EGR VALVE GASKET.DIRTY CLOGGED FUEL INJECTORS WILL CAUSE ROUGH IDLING.

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My '01 Tribute V6 3.0 has a rough idle at a cold start up, once the engine is warmed up and I have been driving for 5-10 minutes it clears up, but until then it will go dead if I do not give it gas at...


Don't waste your time. Have the intake manifold gaskets (upper and lower) replaced. Check all vacuum lines for leaks. Clamp all vacuum hose connections.
Do NOT replace any sensors unless the computer codes indicate.
THIS WILL FIX YOUR PROBLEM!

Oct 09, 2009 | 2001 Mazda Tribute

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Car starts good but has rough idle and dies in a few seconds.


sound like intake leak. get a scanner to see if egr valve not staying open . check map sensor + make sure the vacuum line didnt come off it . check coolant sensor. oxygen sensor .check fuel pressure regulator. check vacuum line that goes to fuel pressur e regulator . make sure there is no gas in it. make sure its getting vacuum. check pvc valve.shake it make sure it rattle .

Mar 09, 2009 | 1992 Toyota Celica

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