Question about Cars & Trucks

2 Answers

Random misfires,lss powr,backfires wont take throttle

With cruise control on runs better ive changed fuel fiter that heled fuel pressure is 55lbs

Posted by on

Ad

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Habit-Forming:

    Visited the website for 3 consecutive days.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Cars & Trucks Expert
  • 124 Answers

Sounds like a timing problem or a vacuum leak. But you do need to specify the year, make, and model for any kind of accurate answer. If the vehicle is OBDII (96 or newer), it should have the service engine light illuminated and needs to be scanned for trouble codes.

Posted on May 04, 2015

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 2,210 Answers

Intake air leak of some sort, vacuum pipe etc but you are going to have to tell us the make model year etc and anything you have already checked?

Posted on May 02, 2015

Testimonial: "thanx tim im gunna go take the egr off see if the piston moves while runnin that would make sence why it only does it occasionally"

  • Timllfixit May 04, 2015

    Take out one spark plug and check the colour. The ideal colour should be mid brown around the outer edge and light brown on the centre insulator and tip. If the outer is very light brown and the centre almost white the air fuel ratio is too weak. This would confirm an air leak or a fuelling problem with the carb or injection system. Don't check the plug after initial start up because its naturally rich to enable a cold start and this would give you a false reading. Check it after a 15 min run. You don't say if its a high mileage engine because there are other factors to consider then. Check also any harness plugs for a full fit in case something is loose.

×

Ad

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

emissionwiz
  • 76164 Answers

SOURCE: 1993 3.1 l Olds Cutlass Supreme runs rough, cruise sluggish, climate control...

sounds like you have a huge vacuum leak at the engine, check under the hood for a sucking noise, I think you will find one.

Posted on Aug 26, 2008

  • 1 Answer

SOURCE: loss of power and misfires

It sounds like the catalytic converter. I had the same problem. What to check....after driving for a couple of miles pull over and look underneath at the converter, if it is glowing there is your trouble.

Posted on Dec 04, 2008

  • 1 Answer

SOURCE: 2004 chevy suburban flex fuel misefire

Compression Test the Cylinders. We had one doing the same thing. It was a warped valve on #4.

Posted on Jun 30, 2009

SOURCE: 2003 GMC Sierra Has recently developed

You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Posted on Nov 24, 2010

ZJLimited
  • 17970 Answers

SOURCE: 2000 civic 1.6. Multiple misfire, random

Hi there:
A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack)Faulty oxygen sensor(s)Faulty fuel injector(s)Burned exhaust valveFaulty catalytic converter(s)Stuck/blocked EGR valve / passagesFaulty camshaft position sensorDefective computer
Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad.
If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Hope this helps.

Posted on Mar 08, 2012

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Have a 97 Isuzu Rodeo v6 has a check engine light codes for random misfire but it has no power taking off is backfiring and go through what's of gas has changed plugs have change coil packs of change...


You'll need to take it to a shop for a diagnosis before you waste any more money.
One possible cause is the fuel injectors or the fuel pressure regulator.

Mar 22, 2015 | 1997 Isuzu Rodeo

1 Answer

I have a 98 chevy lumina with 61k miles.what can I do about these codes, P0300. P1381


P0300 is a random or multiple cylinder misfire, and P1381 is a misfire EBCM (Electronic Brake Control Module) or PCM (Powertrain Control Module) Since you mentioned replacing fuel components, it could be as simple as a fuel injector being clogged up causing a cylinder misfire. Have you checked your fuel injectors?

Jan 21, 2015 | Cars & Trucks

1 Answer

Random cylinder misfire


Scan the computer for trouble codes, unless that is where you got the random misfire code. It may point out the problem. Misfires are usually fuel/air, spark (ignition), or cylinder compression related. The pcm senses a loss of power through the crank sensor, noting the crankshaft doesn't turn as fast as it should. If it cannot isolate it to a particular cylinder, it will set the random misfire code.
Would be good to know what fuel pressure is as a start. Note that cold start problems may be fuel related, as the engine requires more fuel on a cold running engine. If the coolant temperature sensor is out of whack, the computer may not realize it is a cold engine. Just a possibility.

Apr 04, 2014 | 2007 Dodge Ram Truck

1 Answer

I have an 2002 chevy silverado 5.3 1500 getting po300 random Multiple misfires only when i get up and go real fast i have changed the spark plugs, wires, coils were tested there good changes the fuel pump...


Do you know what the fuel pressure is at idle and cruise speed ?
Any vac leaks ?
The code means that more than one cylinder has lost power and not the same one every time. Could be injector problems or fuel pressure or cam-valves among other things.

Jan 07, 2013 | Cars & Trucks

1 Answer

Rough idle random cylinder misfire


misfires are more from problem injectors, low fuel pressure or injector wiring than from plugs
have a fuel pressure test done to check for problem pressure regulator , problem fuel pump , blocked m/dirty filter
one other area of concern is the EVAP system where the purge valve doesn't vent the tank properly and causes low fuel flow rates

May 27, 2017 | 1999 Jeep Grand Cherokee

1 Answer

I have a 95 camaro with a 3.8l. It had a #1 cylinder missfire code, I found out it had a bad fuel injuector so i replaced it. Now, it's showing a random misfire code. What could cause this change


An intake vacuum leak can cause this as well as other issues, read about it below.
Check Engine Light On, P0300 Random Misfire Code A random misfire means your engine is misfiring, but that the problem is not isolated to one or two cylinders. It is jumping around in a random way from one cylinder to another. A random misfire code usually means the air/fuel mixture is running lean. But the cause might be anything from a hard-to-find vacuum leak to dirty fuel injectors, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Even a dirty MAF sensor can cause a lean code and/or misfire to occur. The engine may be stalling because it isn't getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. On most vehicles a normal reading is 17 to 21 inches Hg. If the needle is lower, is jumping up and down or steadily dropping, you have a vacuum problem. Look for possible vacuum leaks by checking vacuum hose connections, the throttle body and manifold, and PVC valve and plumbing. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire. The next thing you should check is the fuel pressure with a gauge. If it is not within specifications (refer to a service manual for specifics because fuel pressure is critical for proper engine performance), the problem may be a weak fuel pump, low voltage to the pump (check the relay and wiring), or obstructions in the fuel line (like a plugged filter). A bad fuel pressure relay can also leak pressure and prevent an otherwise good fuel pump from delivering full pressure to the injectors. Dirty injectors can also restrict fuel delivery and cause a lean fuel condition. Many regular grades of gasoline do not contain adequate levels of detergent to keep the injectors clean. Frequent short trip driving accelerates the buildup of injector deposits. Cleaning the injectors with a good quality fuel tank additive (or having them professionally cleaned) can solve this problem. Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your AutoTap Express DIY. If the numbers are high, it tells you the engine is running lean

Jul 27, 2017 | 1995 Chevrolet Camaro

1 Answer

My truck backfires occasionally and misfires.


Check fuel pressure. When does it backifre, Idle? on accel? cruise? all the time? sometimes? help us help you.

May 13, 2010 | 2003 Chevrolet Silverado 1500

2 Answers

P300 engine code replaced coil,wire,control module runs somewhat better but still has a steady miss and back fires on acceleration or under a load 1998 chevrolet k1500 z71


did you replace all the plug wires and spark plugs if not that may be your problem did not understand if you did or not from your post

Apr 04, 2010 | 1998 Chevrolet K1500

2 Answers

Missfire


Have you replaced the coil yet? I assume by all 4 cylinders misfiring you mean P0300 Random Misfire? It could be a number of other things - a faulty fuel injector, coil, etc. Read this article for more info on random misfires - http://www.obd-codes.com/p0300

Dec 14, 2008 | 1997 Toyota Tacoma

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

Related Topics:

21 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

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

Answer questions

Manuals & User Guides

Loading...