Question about 1997 Pontiac Grand Prix

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The car will starts and then it stops after a rough idle of about 7 seconds. I have replace the cracked vacuum tubing rubber connectors and replace a bad battery. What should I look at next. Oh; I have an OBD II and not codes are indicated.

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It sounds like the fuel pump is turning off. Try pulling the passenger side headlight out and behind it there will be a plug on the wheel well, unplug it and bypass it by looping the circuit. To do this take a short wire or paper clip and make a U out of it and plug it into the plug. Then start the car and it should stay running. If so tape it up so it wont come out and your good to go.

Posted on Sep 01, 2010


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1 Answer

Van idles rough and dies when I stop runs fine when I get going

Sounds like a vacuum leak. Check all vacuum lines, plastic connectors, and vacuum tanks, for small cracks. Spraying lines with crab and choke cleaner will sometimes cause idle to change if cracks are present. Might be necessary to keep vehicle at slightly higher than idle speed to keep it from stalling while checking for leak.

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My 91 Honda accord is idoling super rough! Drives completely fine, but when I'm stopped, it sounds really bad

It sounds like you have a vacuum leak somewhere in your intake manifold system or vacuum hoses.

Generally as the engine cycles, it produces a vacuum that pulls in fresh air through the carburetor and into the engine. This vacuum is also used to control valves such as for your HVAC system inside the car.

However if an additional air passageway forms somewhere, such as a crack in an old rubber vacuum hose or in the gasket between the carburetor and the intake manifold, an unusual amount of air is sucked into the engine without a corresponding amount of fuel. At idle, this makes the engine run quite rough. However at higher RPMs, when the amount of air flowing through this crack is not significant, the engine appears to run fine.

I would recommend looking very carefully at all your rubber vacuum hoses. You might find one that has become disconnected or that is just so old that it has cracked, or an old plastic fitting has been broken. If you haven't done so, you might consider replacing all the rubber vacuum hoses as this is pretty simple and inexpensive. If after you do this, you are still getting a rough idle, then I recommend you take your car to a mechanic and have them look for the vacuum leak or other cause.

Good luck.

Sep 16, 2013 | Cars & Trucks

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My 02 galant runs rough when put in gear but in idle runs okay it also surges up and down replaced the plug wires

Okay, lets start with the oil you found on spark plugs when you were replacing them. this oil is coming from the valve cover tube hole area, notice the plugs go into the holes in the valve cover, there is a gasket the goes around the top of the tubes and when it leaks it goes into spark plug hole, the valve cover needs replacing .
this will cause rough idle and running problems, after replacing valve cover gasket the holes must be cleaned, using crab cleaner, spray into holes and use air to blow out . this may need to be done a few times to get oil out .
after oil is removed . then remove spark plugs and wipe them clean.
The next step is to find the air (vacuum leak) , you said you hear it around intake tube. check for cracks or broken vacuum line. this leak will cause idle problems and driving problems,

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Stop, DO NOT replace expensive parts or O2 sensor! Ford Explorer codes p0174 , p0401 , rough idle and check engine light on. First thoroughly check all of the hoses and elbows connected to the intake and EGR (vacuum system) for splits, cracks, holes or tears, this could quickly cause these codes and fixes for less than $10. Check all connectors and the EGR valve sensor it could have a crack as well, inspect thoroughly because a split sensor could appear attached to the vacuum hoses but hoses could just be sitting there not actually attached due to a split or crack. This was my problem replaced the EGR valve sensor and the two little vacuum hoses attached to them for $50-60 with in stock parts at the local parts store. Took less than 10 minutes to replace and is easily accessible, the check engine light turned off immediately without having to reset the codes by disconnecting the battery, idle became normal and fuel efficiency better. If you have THOROUGHLY inspected every hose, connector and elbow and found no issues, clean the MAF with electrical contact cleaner ( let dry) and clean the EGR with carbon cleaner. A dirty MAF or EGR could also cause these codes to pop up. If this still doesn't work, then consider replacing the EGR, if that isn't it then try the O2 sensor. Good luck!

Jun 23, 2012 | 2002 Ford E-Series

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Hi, I started my 2001 chrysler pt cruiser this morning, the engine started and the tachometer revved to 2000 to 3000 rpms. The brake pedal was also hard to press down to stop the car. I drove the car and...

Check for a vacuum leak. Rubber hoses which do not carry any liquids, but provide a vacuum feed for various purposes.
One such purpose is the brake power booster. A loss of vacuum 'pressure' will affect braking performance and also idle speeds of engine. These are affected more so when engine is relatively cool, improving some when warmed up.

Vacuum tubes/hoses are usually connected to the intake manifold or the mass air flow sensor. The round metal part between the air filter and the intake manifold is the mass air sensor.
Look for tubes which have come loose or worn open or just cracked and dry rotted. Sometimes you can cut the tip off and reseat the tube. Otherwise just replace it. Any auto parts store will have what you need.

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1 Answer

I hav a rough idle , when the car pulls off there is no more rough vibration, i dont recognise it missing when it is idling so i doubt its plugs or coil pack, jus abloody rough idle , any help please

  • First check all vacuum hoses are fitted correctly.
  • Make sure there are no vacuum tubes which are loose or cracked....
  • If some are damaged you'll need to replace or maybe you can shorten just a tiny weeny bit, as long as they can still fit when you've cut away the damaged part. If not you'll need to replace.
  • The plugs may be firing on all four cylinders but maybe not completely.
  • Another problem could be the HT leads which connect the spark plugs. The resistance may have increased.
  • Try taking the vehicle for a diagnostic scan and that may pin point the problem.
Best regards Johngee10

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