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

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

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?


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.



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.


May 08, 2010 | 2002 Isuzu Rodeo Sport

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