Question about 1997 Ford Thunderbird LX

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Changed the intake now engine has a bad miss/hesitation

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Ck for a vacum leak, with the engine cold spray flamable break clean around intake if it revs up or dies you have a leak on the gasket.

Posted on Sep 27, 2009

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I get a random misfire code when my engine is idling on my 04 isuzu 3.5L...i have changed sparkplugs, check all coils, replaced fuel injectors and still get same error message...what should i check ne


you could have a vacuum leak somewhere. check the fuel filter, it may be going bad. and battery. all these will cause a random misfire code. as well as your plug wires. intake air leak, spray carb cleaner around intake manifold while engine is running if the idle changes, then you have a leak. Good-day! but check for vacuum leak first! a vacuum leak will cause engine to hesitate and lose power.

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With the car running take a can of starting fluid and spray around the intake. those cars are known for bad intake gasket leaks. if the engine idles up on its own when you spray it. you have a bad intake. make sure to check and spray vac lines as well.

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Engine has hesitation/miss without a check engine light coming on upon acceleration


there are many things that could cause that from bad gas to weak fuel pump or dirty inline filter or timing chain could be weak or dirty intake or bad catalitic converter or no converter or even a vaccum line off or cracked or even a bad EGR valve so you see theres alot of things that cause poor exceleration or idle. Hope this was some what helpfull.

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2002 1.9 sohc mp efi missing badly on #1 cylinder. new plug .wires,fuel filter.compression good.check engine light been on for several months showing egr fault. cleaned no help.installed another no...


Spray the intake manifold on cylinder number where it bolts to the head with intake cleaner and see if the rpm's change and the miss goes away temporarily.There was a problem at the factory with the intake gasket being creased on cylinder number 1. This issue tends to be a lean misfire issue.

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1 Answer

On 1995 saab engine skipping and hesitation when hot


POSSIBLE CAUSE FOR MISSING AND HESITATION BAD COIL - FAULTY SPARK PLUGS AND WIRES -WEAK FUEL PUMP.CHANGE FUEL FILTER AND CHECK FUEL PRESSURE SHOULD BE 43 PSI. CLEAN FUEL INJECTORS BY FILLING UP FUEL TANK PUT A BOTTLE OF SEAFOAM IN FUEL TANK CLEAN OUT THE INJECTORS.IF ALL LOOKS GOOD.OTHER POSSIBLE CAUSES TO MISSING ENGINE COULD BE INTAKE MANIFOLD VACUUM LEAK OR HOSES LOW ENGINE COMPRESSION.HAVE EXHAUST SYSTEM CHECK FOR RESTRICTION BECAUSE YOUR TURBOCHARGER NOT GOING TO GIVE YOU MUCH POWER ON ACCELERATION.

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1 Answer

3.8L Engine hesitation when given gas, changed, plugs,wiring,dis cap,rotor,fuel fiter?


Try a TPS, throttle position sensor. It both advances the spark and increases fuel pressure when you push down on the pedal. If the TPS does not repair it, then use a water spray bottle around all the intake manifold seams while the engine is running.

If you have a intake manifold gasket leak the engine will pull in the water and change the RPM. An intake leak will throw off all the settings and cause hesitation.

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1 Answer

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