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Engine misfire My classic 500 less race missfires

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Clean carburetta and fuel tank , new fuel and spark plug ! does it have ignition points which you can clean and set a gap ?P...

Posted on Dec 05, 2013

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1 Answer

Rav 4 misses under acceleration


well if engine is ok. No year, no engine stated, wow. !!!
misfire is bad combustion. (gas usa cars are my answers)
  1. never did a TUNEUP this decade? 60,000 miles tunes.?
  2. bad spark first.
  3. bad fueling next too rich causes misfire. lean bogs.
  4. misfire shakes engine hard, is it .
  5. does it misfire parked just racing engine?
  6. cause are many over 50, but if engine good way less, so what can it be (we do tests no Gue$$) bad spark plugs, leaking injectors execessive fuel pressure, bad TPS, sensor. map sensor issues, (even clogged) and others. no engine stated makes waxing smart, hard, way to hard so i quit here.

Feb 14, 2015 | Toyota RAV4 Cars & Trucks

1 Answer

How can I test the crankshaft sensor of a geo prizm 90


1990, i bet its not that, great guess though.
connect the TE1 jumper DLC connnector diagnostic.

race engine ,watch CEL flash out codes.
if the CKP is bad the ECU WILL REPORT IT.

horrid lack of power. is caused by many things.
horrid it is if 1500 rpm is max in neutral, hard failure.
did you do the 60k mile tune up, if not why not now>?

on ALL 1990 engines, i check compression first.
why, well its freak;'n old and reason 2 , the cam belt may have slipped.
if compression is not 150 PSI or more. and is like 80 or less.
that belt has slipped. as they say, dont pass go or collect $200
as all hope is lost, playing with spark or fueling on any dead engine

lost of power on a good engine 101:
bad spark, replace the rotor, cap, hV wires and spark plugs.
BINGO? yes, tunes ups worn wonders on no service cars. as is par for course on 90.
bad spark is classic, the RPM is limited at 1500 but i can here it misfire. the classing sign of bad spark , MISFIRE.

,next and always last is fueling
fuel can not burn if spark is bad,(otto cycle engines) and compression dead.

ill stop here as fueling has over 10 more tests.
im not typing them until basics are good.

Jun 27, 2014 | 1990 Geo Prizm

1 Answer

Running rich


Hi Justin
you seems that you have a good idea about engines and injection systems, lets say that the computer see's rich exhaust and pulls back fuel mixture. creating misfire. why the engine is misfiring on one cylinder only??
my advice to you
1 search for a vacuum leak corresponding to the misfiring cylinder, like a manifold gasket or injector seal.
2, do a compression test for all cylinders, probably you have a burnet valve.
Good luck and let me know how it goes.

Mar 03, 2014 | Kia Sedona Cars & Trucks

1 Answer

Check engine


no year,. wow.
there 50 causes. (have list ,ask but is point less)
i use 5 -10 tests to find true cause
do you want to test, or guess?
step 1, ever done 60,000 mile (interval) tune up this DECADE?
ask for more steps, have them all.
bad spark plugs can not burn fuel;
and clogged fuel filters, cause weak injection and lean misfire.

Feb 26, 2014 | Acura MDX Cars & Trucks

1 Answer

Victor 930 2


Sounds like you have problems with the turbo as thee is a bearing there and you said it starts rattling once the turbo kicks in. There is one other thing, you may have internal engine damage as like you said, only 500 miles and some of that was racing. May not have been broken in properly. I know I was told you need to break an engine in for 500 - 1000 miles then change the oil. I hope this is not the case for you though.

Jan 06, 2014 | Porsche Cars & Trucks

2 Answers

Check engine light flashing runs rough not firing on all cylinder2000 lincoln navigator with large triton engine Hooked up diagnnostic and it said 1. system too lean bank #2 2. Unable to bleed up fuel tank...


you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.

Apr 20, 2010 | Lincoln Navigator Cars & Trucks

2 Answers

Misfire on 2000 Ford Exp 5.4l triton engine


what is the missfire code, has the recall been done for the leaking heater core coolant hose? the leak drips onto the passenger side ignition coil and shorts it out and causes a missfire.

Oct 20, 2009 | 2000 Ford Expedition

1 Answer

Misfire only in drive when idle. Ok when driving


you have an ignition coil going bad if the check engine light is on have the code pulled and it will pinpoint witch cylinder is missfiring if it is not on you will need a scan tool to watch the missfire in data mode to pinpoint it that way.you may also find when you pull the coil out that is missfiring it may be covered in oil you will need to replace the valve cover gaskets if this is going on and clean the oil off the coil and **** the oil out where the spark is

May 29, 2009 | 1999 Ford Expedition

1 Answer

BMW 523i 1999 model


your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

May 28, 2009 | 2001 BMW 5 Series

1 Answer

When idling my 2003 Acura TL the engine seems to want to almost die, also when i got on the freeway it seem to pull hard and **** like it was having trouble shifting into 5th gear. It also seems to run...


Hi,welcome to fix ya.
try disconnecting the coils one at a time and noting the drop in rpm of the engine. if one drops less then the others or not at all replace that coil. If they drop the same on all cylendars then adjust the valves .The exhaust valves get tight and can cause missfire as well.

Apr 01, 2009 | 2003 Acura 3.2TL

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