Question about 1996 Ford Windstar

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No misfire no check engine the scanner read vacuum problem but i'ts not

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On the back of the motor (you can get at it by removing the engine cover in the van)... there is a boss on there that has "eighty gazillion" vacuum lines on there. Check each and every one to make sure that it is on its nipple and that the line itself has not cracked or broken due to heat/age.

Also, consider that a motor may not signal an error condition on the idiot light or misfire to have a vacuum problem. The problem may have developed over time, and you have just not noticed it because the performance of the engine has been decreasing ever so slightly over time. You just don't notice it because it didn't happen overnight AND it's not missing or anything obvious...

Posted on Mar 06, 2009

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My citreon c4 is miss firing and shuddering


Hello Denise;
Do you have random misfire or misfire on a particular cylinder?

FIRST: Read the codes with a scanner!!!

-- If its one cylinder: check the plug wires, coils, spark plug; overall you should check for electricity and spark. If these pass; you may want to perform a compression or leak-down test to confirm the cylinder is fine.

--Multiple misfiring:
Usually; when you have misfiring you would look for:
1. Check if there's a vacuum leak in the intake manifold and breather hoses; those running from the manifold, usually they may have leaks or have become cracked; any leaks into the manifold asides the airflow meter is unmeasured and will cause misfiring.
2. Check the fuel pump; use a fuel pressure tester; if you get your hands on the c4's manual you should know the optimum pressure and determine your pump is fine.
3. Check fuel filter; maybe change this out.
4. Check the integrity of the Catalytic converter; if you have a clogged converter your engine will misfire badly, rough idling will occur and it tends to run hotter, shorten the life of the airflow meter etc. This is one overlooked area; if your car is over 100k miles; just change this out.
5. Check your MAF sensor; clean with 95+% methylated spirit or other official MAF cleaners; methylated spirit works fine, just ensure it dries up nicely.

Jul 28, 2016 | Cars & Trucks

2 Answers

2000 chevy silverado p0171 ; p0174; p0300


Sounds like you have a serious vacum leak.; DTC 0174 and 0174 are lean conditions on bank 1 and bank 2, 0300 is random misfire. The only thing I can think of is a big vacum leak like the brake booster / vac line leaking, or maybe the intake manifold is cracked ... even a stuck-open EGR doesn't normally lean a motor that much. Start by checking for a vacum leak, if the motor will idle you can spray a little WD-40 around ports and lines >> if the idle speeds up or becomes smooth you on the right track in the area you judt sprayed.

Feb 26, 2015 | 2000 Chevrolet Silverado

1 Answer

Number 4 cyl. misfire/ 2.4rz engine/98 toyota p.u. how to fix misfire of number 4 cyl.on toyota 98 tacoma p.u./2.4rz engine


check compression, check valve clearance, check injector for properly working, check for vacuum leak around this cylinder.

Feb 10, 2015 | 1998 Toyota Tacoma

2 Answers

Misfire on mercury grand marquis p305


I answered this already

If a MIL Lamp is flashing please do not use the car

That on a ford that is called a Class A Cylinder misfire & will
destroy your exhaust converter, as well as possible other
engine damage,work on the misfire issues

Jan 24, 2013 | 2001 Mercury Grand Marquis

1 Answer

At idle vech starts running rough and check engine light starts to flash if i try to drive vech runs very rough and won't pick up speed. checked code with scanner and found code p300 mulitiple random...


Check for vacuum leak.Check all vacuum hoses and especially around the intake manifold these motos are prone for intake gaskets leaking.This will cause a code P0300.HOPE THIS HELPS!!

Apr 19, 2011 | 2003 Chevrolet Silverado 2500HD

1 Answer

1998 Saturn sl2 stalling after coming to a stop. No lights on. Snap on diagnostics ran with nothing showing up. new ignition module, coils, spark plugs, wires and crank sensor. Mechanic said no vacuum...


I have ran into this problem. When the car is cold the vehicle will run good. When it warms up the vehicle might start acting up. Spray carb cleaner on the back of the intake air manifold Doesthe car bog or rev up.The manifolds expand as they warm up and create an intake gasket vacum leak. Some mechanics don't know how to use the scanner. Did they go into the misfire moniter on scanner? What are the fuel trims, this will tell if the vehicle is running rich or running lean. This is a hard problem to diagnose if you don't know how to read a scanner. If you could tell me the fuel trim readings I could help you out more. You can have a misfire and not have a check engine light on. But I am willing to bet the intake manifold is leaking.

Oct 28, 2010 | 1998 Saturn SL

1 Answer

2002 Isuzu Wizard V6 Petrol engine. Went to start it and it turned over and went to fire up but then just cut out. Tried it again and it started fine?


Hi.

A failed start can happen for a number of reasons. If this happened just once, it should not be reason for concern.

If the problem happens again, the first test you can do to locate the problem is an OBDII code scanning.

The scan can be done at any local garage. If you purchase a scanner like the ones linked below you can read the codes by yourself.

OBD-II-Scan/dp/B001LHVOVK

OBD2-Trouble-Code-Reader-Scanner

The connector is located under the dash.

Once you have the codes you can get back to us for an explanation. Here you can also find basic info on OBD codes.

If the problem happens regularly, then other test that must be done is checking fuel and vacuum pressure using a Vacuum and Fuel Pump Tester. This is a gauge that must be placed in between the lines to read pressure.
By reading fuel pressure it is possible to spot problems caused by blockage, fuel pump malfunction and problems with fuel pump aeration.
By reading pressure on vacuum lines whilst heating the lines with an hand torch (this must be done by a mechanic), you can find vacuum leaks.

Engine shut down can be caused by a number of reasons. Among possible causes misfire, rich or lean mixture, air intake blockage, MAF or AIT sensor problem, fuel circulation problem, vacuum problem, fuel tank cap not allowing air in, electronic injection problems.

If you get the problem again, read codes and replace spark plugs, air filter and fuel filter.

Regards.

May 08, 2010 | 2002 Isuzu Rodeo Sport

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