Question about Jeep Cherokee

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Duel fuel runs perfect on gas. petrol not so good coughs and splatters when you place your foot down Yet idles smooth, could it be the mass Air sensor?

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Do you have OBD 2 emission system? Have you taped lightly on the MAF Sensor to see if engine sound changes? If the system is OBD 2 you can disconnect the MAF and the PCM computer will subsitute a signal for the MAF sensor and the engine will run fine, try that and get back to me.

Posted on Jul 25, 2008

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Posted on Jan 02, 2017

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We just got a 2004 Chevy Express. When you start it and put it in gear, it dies. The battery appears dead and you can jump start it.


IAC - idle air control problem possibly .( You can drive it if you use your left foot to brake but keep the gas pedal down to keep the RPMs up.) Wouldn't be a fuel filter , if fuel filter was clogged partly it would idle ,but would lack power ,low fuel pressure at higher speed's . Do you know what IAC valve is ,an how it works ?
Idle Air Control Valve
Or maybe the EGR valve pintle is covered with carbon an sticking open .
Or possibly a dirty or bad MAF sensor - mass air flow sensor - the PCM - engine computer needs info from this sensor so it know's how much fuel to feed the engine .
Hooking up a professional type scan tool to view engine sensor data cut's down on guessing as too what the problem is .

007 Idle Speed Problems Scan Data for Idle

Nov 09, 2017 | Cars & Trucks

1 Answer

91 olds cutlass supreme runs rough and wont stay idle.


If your vehicle is fuel injected I would say you have a blown fuel regulator. This would cause excess fuel into the cylinders (flooding) causing a miss and coughing and also blow fuel into the air breather. If will also cause the vehicle to run poorly and could cause the vehicle to stall. Also to much fuel on startup can flood the cylinders and cause the vehicle to no start.

Jun 16, 2017 | 1991 Oldsmobile Cutlass Supreme

1 Answer

Car starts running rough at idle, eventually quits running. Has new plugs, wires, cap, fuel pump, fuel filter, air filter, IAC Valve, and gas cap.


Back then, Honda suggested timing belt replacement every 60,000 miles. If your Honda has that much mileage or more and has never had the belt replaced, now may be the time.

Sep 11, 2012 | 1995 Honda Accord

1 Answer

Car barely holds an idle and sometimes stalls when coming to a stop


There could be several causes for your stalling problem.
  • Bad plugs
  • Bad wires
  • Clogged fuel injectors
  • Bad MAF (Mass Air Flow) sensor
  • Bad TPS (Throttle Position Sensor)
A basic tuneup would rule out the plugs and wires. Fuel injector cleaner will clear most clogged injectors. Once ruled out (or if the car is running smooth apart from stalling at a stop) the most common problems are MAF and TPS.
The TPS in particular regulates idling speed under all conditions. Included in this would be while the engine is warm. If your car wants to stall unless your foot is on the gas, I'd lean toward the TPS.

Oct 05, 2011 | 2006 Ford Focus

1 Answer

Ford 05 plate 1.8 tdci on starting every day wether morning or later - cold stsrt there is a puff of smoke - blue or grey. the car starts no problem but chugs slightly on starting and sits aprprox...


It sounds like it's getting more fuel then it is air check the fuel filter and the mass air flow sensor it regulates the amount of air send it to the computer and the computer breaks down how much gas to operate the vehicle and run smooth hope this helps text George

Oct 25, 2017 | 2005 Ford Focus

2 Answers

1997 ford expedition will start but wont stay running unless you hold your foot on the gas pedal. Replaced mass airflow sensor because that's the code that came up. Doesn't do it all the time.


if code keeps coming up re check sensor and connections and if not done replace air filter ----if good than check fuel prssure sometimes clodding fuel filter can cause same problem and set off sensor

Jan 04, 2011 | Ford Expedition Cars & Trucks

2 Answers

1991 Ford Mustang 5.0 L HO, had been setting up for 10 yrs. cranked & ran good a few trips around the block, and then stopped idleing or running smooth under 2,000 RPM. Could it be the Mass Air censor?


Mass air flow would probably shut you down. You could clean Mass Air Flow Sensor and see what happens.Try scanning for codes then looking for vacuum leaks. Use a propane tank with a gauged nozzle to help look for vacuum leaks.

Aug 16, 2010 | 1991 Ford Mustang

2 Answers

Toyota 3y engine fuel system


LPG 3Y engine toyota crown comfort automatic - fuel consupmtion is 13.30litre per 100km? How can this be reduced?

Jan 08, 2010 | 2002 Toyota Camry

1 Answer

Runs erratically


The idle air valve (located below the throttle body) provides the control for constant idle speed. In order to set the correct air valve opening to achieve constant idle speed, the fuel injection control unit uses information from the air mass meter, throttle valve switch and the ignition control unit (RPM signal) to regulate the output current to the idle air valve. This means that the idle valve is not affected by air leaks or a jammed throttle valve.

Nov 03, 2008 | 1986 Volvo 740

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