Question about 1999 Pontiac Grand Prix

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Number 2 injector stays open.

Car runs ok at first then once it starts to warm up it starts hesitating.

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  • Pontiac Master
  • 45,551 Answers

Replace the injector and check wiring for poo contacts and dirty pins.

Posted on Nov 17, 2013

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Posted on Jan 02, 2017

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SOURCE: The car is hesitating while driving. The battery

is it a flat spot or a cut out die restart type problem? if its the latter check out your crank/flywheel sensor

Posted on Jul 13, 2009

  • 14036 Answers

SOURCE: dead cylinder number 2 bad injector number 2

use a digital volt meter,put it on the ohm scale check number 2 fuel injector should be 11 to 16 ohms if not reads zero fuel injector faulty.if numbe 2 fuel injector okay.use noid light hook it to fuel injector electrical connector with fuel injector disconnected and see if pcm is firing the fuel injector noid light should blink when cranking the engine.if light steady pcm not firing 2 fuel injector,if noid light dont light up.there is a open in the wiring connector 2 fuel injector 2. if fuel injector okay,check spark plug, carbon foul you have a bad ignition coil or wire if you see oil on spark plug you have worn piston ring or leaking valve guides allowing oil to foul out spark plug.do a compression test check compression to see condition of the cylinder.

Posted on Sep 02, 2012

perkins48
  • 14384 Answers

SOURCE: Cylinder 1 and 2 misfire on 1992 Pontiac Grand Am

Check the piston rings,are them plugs oily.

Posted on Oct 26, 2012

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1 Answer

I have a 2000 4.3 liter vortec and its showing a misfire on number 5 and i have checked all the basics and then some. it hesitates trying to start except for first thing in the morning


It could be a fuel or compression problem that is causing your misfire. To eliminate a clogged injector as a possible cause, you can swap injectors between cylinders and see if the fault follows the injector in question. Or it could be a fouled or incorrectly gapped spark plug causing the misfire. Do a compression check with the engine warm, preferably right after a misfire event.

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When i start the truck it run ok but as soon as it warms up or get shifted into gear it hesitates like its not getting fuel, an injector is bad maybe a


I would be looking at two things.
1. Vacuum leak. This can cause the hesitation by making the fuel mix too lean.

2. Temperature sensor. If worse when fully warmed up, this can be a cause.

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Number 2 injector stays open?


try running a couple cans of fuel injector cleaner through the tank-Denny

Nov 17, 2013 | 1999 Pontiac Grand Prix

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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.

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Could you explain this a little better , hesitates at tip in after you first start it when warm > hesitates at tip in ???? plus after first you first start it when warm . What's warm ? the engine ? The temperature out side ? Or after you had it running an shut it off an restart the vehicle ? The engine temp. is warm , hot etc.... cooling fans working , vapor lock ?

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Runs rough till warmed up. Hesitates. I put a new


Ok, you got new 02 sensors, that is good, Now check timing, vacuum hoses for leaks, check for headgasket leak with compression test, Check or change fuel filter and plug wires. If fuel injected, try using injector cleaner and you can also remove one injector at a time to make sure it is not leaking or plugged. You can also test throttle position sensor and idle position sensor with an ohmmeter to see if they are good.

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Once truck is started if i drive it has a lag


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