Question about 1990 Chevrolet K2500

1 Answer

1989 chevy blazer full size rough idle

Been Parked for a while; changed out- fuel pump, MAP sensor, AIC, fuel injectors, EGR valve/silenoid, and spark plugs.... still running rough at idle. checked timing/cables/rotor,-- im lost?????

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

  • Chevrolet Master
  • 21,375 Answers

Check the CO/Temp sensor in the exhaust manifold. It may tell the ECU that the engine is hot when it is cold or cold when hot, getting the mixture wrong.

Posted on Mar 25, 2014

Testimonial: "Thanx- changed the temp sensor by thermostat and upstream oxygen sensor.... runs better. NOT smooth just yet... someone told me to change the knock "sensor".... we'll see....."

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

its just white cuz i too the cat off..

cuz i thought my proble could have been to do with the cat...

cuz i lost power driving up hills and on highways now it just will start the die right away

or start and idle really bad...

any ideas???

i was thinking crank sensor.. or injectors

Posted on Oct 01, 2008

  • 1 Answer

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

  • 1 Answer

SOURCE: 1989 Cavalier Z24 3.1 rough idle and hesitation

I had the same problem with my Z when i had it. But it worked when i just left the little hose off of the EGR valve.

Posted on Jun 13, 2009

  • 4088 Answers

SOURCE: 1987 chevy s10 2.5l tbi will not start. changed

That eliminates the crankshaft and camshaft position sensors. Have you checked the fuel injector itself for an open winding or stuck valve plunger? There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. But at least the engine should try to run if poorly. Take the injector out, dry it off with air, and intermittently apply 12 volts to one terminal while grounding the other. You should hear a click from inside every time you touch 12 volts. If not, replace it. If it does, it may be plugged with debris. Try blowing through it in reverse with compressed air.

Posted on Jul 17, 2009

Vicarious81
  • 4 Answers

SOURCE: 1992 Chevy Silverado idles rough why?

Check your MAP and TP sensors. Your throttle body may be having trouble determining position and is compensating by adjusting RPMs.

Posted on Nov 30, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2001 honda odyssey has a p1399 code changed spark plugs and checked coils but still has a rough idle maybe egr valve or ports blocked with carbon


code p 1399 refers to random misfire ===causes --fuel /ignition--MAP sensor---IAC valve ( idle air control valve )
misfires are more from faulty injectors and low fuel pressure than from electronic problems
unless you have been burning lots of oil , the ports will be clean so have the injectors serviced

Aug 31, 2016 | 2001 Honda Odyssey

1 Answer

1997 dodge dakota running really rough


So many options...oxygen sensor, egr valve, pcv valve, premium gas.

Dec 01, 2013 | 1997 Dodge Dakota

2 Answers

1989 chevy s10 4.3L 4x4 (automatic)Truck idles and runs great when cold. As soon as it reaches operating temperature It acts like it's not getting enough fuel. It will have an erratic idle and when I...


Chances are you have an oxygen sensor problem. When the engine warms up, the engine computer moves from open loop operation to closed loop, and it then uses the O2 sensor readings to adjust the fuel. If the sensor(s) is contaminated, it will send a false reading to the computer causing this problem.

Mar 11, 2017 | 1989 Chevrolet S-10 Blazer

2 Answers

1998 chevy blazer running really rough. It used


I had a similar problem and just happened to unplug the temperature sensor for the computer and the engine started running smooth.
So I replaced the temperature sensor and all was well!

Apr 27, 2010 | 1998 Chevrolet Blazer

1 Answer

Shakes while idling and sometimes stalls.


check for minor vacuum leak and map sensor,pcv,egr valve

Oct 13, 2009 | 2001 Chevrolet Blazer

2 Answers

1987 chevy S10 engine idle problem


relace the throtle air idle valve.The temp switch will allso cause this problem.

Jul 19, 2009 | 1987 Chevrolet S-10 Pickup

1 Answer

Runs but dont want to idle smooth tech 4 motor sometimes it smooths out then rough again thanks


1 Inspect M.A.P. Sensor Faulty M.A.P. Sensor. 2 Inspect EGR Valve Improperly Functioning or Faulty EGR Valve. 3 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 4 Inspect Idle Air Control Valve Damaged, Loose, or Faulty Idle Air Control Valve. 5 Inspect Idle Speed Actuator Damaged, Loose, or Faulty Idle Speed Actuator. 6 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor. 7 Inspect Fuel Filter Clogged or Dirty Fuel Filter. 8 Inspect PCV Valve Plugged or Damaged PCV Valve. 9 Inspect Carburetor Worn, Faulty or Damaged Carburetor. 10 Inspect Valve Burned, Worn, or Sticking Exhaust Valves. 12 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s). 13 Inspect Fuel Pump Faulty Fuel Pump. 14 Inspect Camshaft Camshaft Lobes Worn. 16 Inspect Point Set Burned, Worn or Incorrectly Set Ignition Points.

Jul 01, 2009 | 1988 Chevrolet S-10

2 Answers

1989 Cavalier Z24 3.1 rough idle and hesitation


It sounds like you may have a broken exhaust valve spring, although, like you have found out problems like this can be very hard to diagnose, but anyone with a compression tester and couple other tools could find out if this is the case. Hope this gives you another idea where to look.

Sep 29, 2008 | 1989 Chevrolet Cavalier

Not finding what you are looking for?
Cars & Trucks Logo

148 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75807 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22133 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8172 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...