Question about 1992 Pontiac Bonneville

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The motor is running like there is a vaccum leak but ALL hoses r good. The diagnostic tester read no computer problems. Kinda at a loss

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Your mass air flow meter is bad, change it and replace air filter at the same time...or it's the idle-air control valve.

Posted on Jul 13, 2009

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Could be a problem with the smog pump, assuming it has one. Chek the PCV valve, if it is stuvk open or worn out it will affectivly be a vac leak. Good Luck

Posted on Jul 12, 2009

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1 Answer

What are the probable causes of DTCs P1402 and P1403?


Code 1402 is a problem with the DMTL motor and 1403 is the circuit for the valve.
It involves the fuel tank leak tester.

Faulty Diagnostic Module Tank Leakage (DMTL)
- Diagnostic Module Tank Leakage harness is open or shorted
- Diagnostic Module Tank Leakage circuit poor electrical connection
Read more: http://www.autocodes.com/p1403_hyundai.html#ixzz44VrYa4Tf

Mar 31, 2016 | 2002 Hyundai Accent

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1998 neon hard start runs rough low vaccum


Low Vacuum --measured where & how?

Low intake manifold vacuum ?

Do a Cylinder Leak Down Test--pretty much indicates
the motor is worn out ,or you have a valve issues

Check the timing belt & look at MAF , Fuel Trim & O2 Data

Do a cylinder balance or cylinder contribution test before
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Jul 28, 2014 | 1998 Dodge Neon

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My 1999 Chrysler town & country limited my engine light came on. I whent to get a test done, it said DTC Reported P0505= idle control system malfunction P0351= Ignition Coil A Primery/secondary Circuit...


-Possible causes are Faulty Idle Control System motor
- Idle Control System motor harness is open or shorted
- Idle Control System motor circuit poor electrical connection
- Faulty Powertrain or Engine Control Module
- Vaccum leaks or damaged hoses or improper routing check for vaccum leaks first if this was helpful please leave good feed back


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Oct 29, 2013 | 2007 Jeep Grand Cherokee Overland

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1988 isuzu 4x4 2.6 has a rough idle and loss of power


check for any vaccum leaks. is check engine on? use long nose plyers to crimp vaccum hoses. , if engine changes tone you found the problem....also, look into the intake , and see if anything is blocking the mass air flow sensor... more later.

Dec 29, 2011 | Cars & Trucks

1 Answer

I heard a squiky noise like some kinda old belt rotating, then it stop. 2 miles later i saw temp rise. i pulled over and antifreeze was splatter from the top of radiator.


Check the radiator hoses for a leak. The splatter was most likely the coolant/anti-freeze leaking from one of the hoses. Loss of coolant would make the temp rise and the engine overheat. If the hoses are good, look for seepage around the waterpump. These are the main causes for coolant loss.

Oct 28, 2009 | 1998 Volkswagen Jetta

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98 cherokee had gunky cooling system, got it flushed and temp gauge was reading low afterwards. diagnostic computer said the cooling system circuit had high input so i replaced one of the temp sensors. now...


STOP DRIVING.

Go to a shop and ask for a cooling system pressure test.

After they pump up the coolant system,they will point out is there any INTERNAL or EXTERNAL leak(s).


Internal leak is the first sign of blowing head gasket. (NOT GOOD)

External leak can just a small hose.


Start monitor cooling loss.

Start monitor the oil level

Change the thermostat and gasket.

The temp sensor is cheap. Change it at the same time.

Use 60/40 coolant mix is you has high odometer reading like 160,000+ miles


DO NOT ALLOW the coolant and oil cross mix.

As soon as it mix,you are ready for a majot head gasket repair.


Good luck.

Jul 15, 2009 | 1999 Jeep Grand Cherokee

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Check engine light keeps coming on in my 2003


there are two reasons why this code will set 1st is a vaccum leak next is a bad mass air flow sensor if you have access to a good diagnostic computer you can read live data to pinpoint the problem if you don't have access try to find the vaccum leak in the engine compartment if there isn't one replace the mass air flow sensor

Jun 06, 2009 | 2003 Buick Rendezvous

1 Answer

I have a 92 honda accord and it seems to run through water fairly quick. there are no leaks that i can see..what seems to be the problem?


My Civic has 7 or 8 hoses to distribute coolant and some were in some pretty difficult to see spots. If your Honda is similar then there may be a hose leaking that you missed. There is also a bleeder valve to get the air out. If you didn't bleed it the last time you filled the radiator you will have the air pockets eventually get pushed to the radiator so it will LOOK like you are losing water. Also freeze plugs (assuming you have them) might have sprung a leak somewhere and they are always difficult to locate.

If it's the head gasket you can also use a vaccum tester and a cylinder leak down tester to further evaluate the condition of your head & valvetrain before tearing your engine apart. Good Luck

Apr 24, 2009 | 1992 Honda Accord

1 Answer

Service Engine and Service Vehicle lights


You can generally find a vaccum leak by pressure testing the system. Most auto parts stores sell a vaccum tester relatively cheap. Or you can take it to a shop and they will pump your sytem full of a uv sensitive die and then use a black light to find the leak. If it says vaccum leak at engine on the vent solenoid then all you need is the schematic of your vaccum system to find the solenoid and you should find your leak theoretically.

Apr 04, 2009 | 2001 Pontiac Grand Am SE

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