I got a 07 forenza that has coils 1 through 4 misfiring.it starts and idles fine but when i push gas it misses and tries to line out.what could cause this

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

The compression could be too low to create the bang it needs, I have seen it a lot, try the connecting wiring harness first it might just have a bad connection, but it does sound like low compression

make sure you have the wires in the right places. (see pic)
Make sure you did not leave something unplugged. (sensor/vacuum line)

I would start with the inlet manifold gasket, these are know to break down causing vacuum leaks which can cause this issue, also check around engine for other vacuum leaks

apply brake and accelerate engine while vehicle is standing still, you need to apply brake hard, DO NOT do this for a period of more than 1 minute or you will be putting alot of stress on your transmission. you will be trying to set off the "check engine" warning lamp or the "service engine soon" warning lamp, and get a misfire failure code, after code sets on your vehicle computer, get it scanned it will tell you which engine cylinder is misfiring ie "P0301= cylinder #1 misfire" then check out spark plug, spark plug wire and ignition coil. one of them is probably causing this.

the only reason it stoped missfiring when idleing was cause your moter was running off the extra boost of the carb cleaner try replacing the plugs and wires before doing that again boss. and you can fid out if its a hard miss by power braking put it in drive and keep your foot on the brake then increase the gas till the car tire just starts to slip if it misses really bad u have a hard miss caused by a coil pack or really worn spark plug or bad plug wire.

Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25% of the engine's power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle. The engine also may be hard to start and may even stall at idle, depending on the accessory load (air conditioning, headlights and electric rear defroster, for example).

When misfire occurs, performance suffers along with fuel economy, emissions and idle quality. And, when a misfiring vehicle is subjected to an emissions test, it will usually fail because of the unusually high levels of hydrocarbons (HC) in the exhaust.

What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason. Intermittent misfires can be a real challenge to diagnose, so let's start with a steady misfire in one cylinder before moving on to intermittent misfires.

Hope this help.

leaky cylinder headgaskets!!!! car sits usually after just being driven coolant under pressure finds leak in gasket seeps into cylinder mind you it only takes a little dribble or two next morning you go out get in start up car misfiring,running lil ragged then begans to smooth out. stop @ store a few moments later come out restart car no miss runs fine till next morning sound fimilar have them checked

The coil packs on these engines will show signs of Arc tracing. Its a white shadow or line that runs along the rubber boot. if you see this. Suspect that coil of grounding and causing a misfire. Misfires usually occur after an electrical part is hot, the rough idle for the first 30 seconds sounds like another issue altogether, especially if it goes away after 30 seconds. Misfires from coils dont usually go away,,,,, they just get worse. Good luck . I also use this forum for my Toyota truck issues, I own one with the 3.4. heres the link http://www.tacomaterritory.com/forum/

i have a 2001 chevy z-71 5.3L. I keep getting a random/multiple misfire code for cylinder 1 . I have replaced plugs, wires, coil pack(only on #1 cylinder)., and fuel pump. I still keep getting the cylinder 1 misfire code. I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem?