Question about 1991 Chevrolet Caprice

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Runs good cold but loses power and hesitates when warmed up.

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Classic signs of a plugged catalytic converter ... I would have a exhaust shop check it out for you , the newer aftermarket design is much less of a problem than the old pancake style and fairly cheap.

Posted on Oct 24, 2010

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1994 chevy suburban help


It could be low fuel pressure from a weak pump. A fuel pressure test would find out. When the engine is cold, the computer keeps the injectors open longer-a cold engine needs more gas to run than a warm one. When at normal operating temperature, the computer matches the gas to the incoming air. If you have low fuel pressure against the injectors, that is when you would notice the hesitation. A possibility anyway.
If fuel pressure is good, check for trouble codes. A sensor may be sending the wrong information. Could be the mass air flow sensor-the one that tells the computer how much air is coming in so it can match the right amount of gas for it-through the injector on-time. There it is, your injector pulse width is too narrow. Causes lean running, stumbling, hesitation. Another possibility. Check for codes first.
If not air or gas related (is your air filter clean? And the gas filter been changed in the last 2 or 3 years?), and no codes, and fuel pressure is good, you may have to keep looking for an electrical fault. If it runs good when cold, doesn't seem likely to be a mechanical fault.

May 23, 2013 | Cars & Trucks

1 Answer

96 f-150 6 cylinder runs good cold warms up and loses power


Could be several things.
Is the check engine light on ?
Have you checked fuel pressure cold and hot ?

Feb 13, 2013 | 1996 Ford F150 Regular Cab

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My 1993 Taurus GL is experiencing a loss of power. Hesitates on acceleration and will lose power if I go over 40 mph. Spark plugs were changed, air filter, coolant sensor etc. No resolution. What can cause...


I have a 1993 Taurus GL V6 3.0L..I"am experiencing a loss of power. Hesitates on acceleration Only when It's cold.When is get hot it runs very good. I have Replace Spark Plugs Cap & rotor were change air filter & fuel filter & TPS/EGR..... & it has a rebuilt ENG in it...this could be a sensor. But which one could it Be?

What Can This Be?

Nov 02, 2010 | 1993 Ford Taurus

2 Answers

Runs good cold then loses power when it warms up


have your spark plugs changed. use the correct specification.

Apr 28, 2010 | 1989 Ford Bronco II

1 Answer

Engine runs fine when cold, hesitates when warmed


The EGR valve is closed when the engine is cold and should open when warmed up. Have all componets check to see if they are functiong correctly. Auto Zone provides a free computer scan at no charge . They will avise you what is in need or replacing and how much for the part. These parts are easily installed too

Apr 24, 2010 | 2002 Chevrolet Malibu

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I got a 1988 ford f-150 4x4 302 engine it idles good but when your driving it hesitate and stalls.


I had this problem also and it turned out to be related to the cold start system. cant remember the part name but it was causing the hesitation problem.

Oct 26, 2009 | 1988 Ford F 150

1 Answer

92 SR% Toyota


That's probably the problem the broken wires. The 02 sensors send a rich/lean signal to the ecm. If they aren't working right, a lean or rich situation will occur. Best to get the wires fixed. If the wires broke off at the sensor, need to replace it.

Jun 15, 2009 | 1990 Toyota 4Runner

1 Answer

Car stumbles,hesitates,loses power on Hwy, randomly


Did you check earth connection of electric system?

May 10, 2009 | 1995 Oldsmobile Eighty Eight

2 Answers

Hesitates like it want to flood when starting, Getting worse


Could be aging ignition cables letting you know that winter is coming and the condensation that can form overnight can invade cracks that can bleed off some of the high voltage you need at the spark plugs. After the engine is warm, leaky cables can temporarily 'heal,' drying out and losing less than when cold.
If they are sufficiently bad, sometimes you can see some sparkling going on under the hood if you park in a dark area. 
If you have 50k on your plugs, it may be time to replace those too.  

Oct 02, 2008 | 2001 Nissan Sentra

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