Question about 1990 Pontiac Firebird

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Lack of power when driving

When taking off or load is put on motor rpms drop andit seems to have no power i did a commpression test all of the cylinders have good compression timing is correct by the way the motor is a 305 pontiac

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  • Michael Masters
    Michael Masters May 11, 2010

    when was the last tune up on this vehicle?

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  • Pontiac Master
  • 6,982 Answers

Test map sensor, throttle position sensor and mass air flow sensor all influence timing (You are checking base timing only) and fuel delivery. Also check temp sensor as if it's not working the computer will never know when to change over to warm run mode. Is ecm fuse installed and good?

Posted on Sep 25, 2009

  • Richard Scordino Sep 25, 2009

    One other item. Catalytic converter can also do that

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Posted on Jan 02, 2017

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How to check fuel pressure testing


low fuel pressure presents as misfires and lack of power
not increasing rpms indicates accelerator position sensor or throttle motor sensor

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Does the driving on overdrive mode cause high fuel consumption, because the transmission use the first three ratios mostly?


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OD should come in around 60 klm/hr and drop out at around 50 klm/hr. When you are accelerating hold the pedal in a set position and watch the rev counter (rpms ) and each gear change you will see the rpms drop and then build back up as the vehicle speed increases At 100klm/hr the revs should be around 3200 rpms or less but if over ( say 3500 rpms) then may be the OD is not coming in. One way to test a box operation is to find a speed shop with a dynomometer and test the gear selections against loads and engine rpms

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I was driving up a hill and the car needed more power it would downshift and the rpm were really high and engine was loud. then I hit another hill and engine was loud at it jumped to 4,000 rpms and di


Sounds pretty normal for a 4 cylinder car, if that is what you have. It could also be considered to be normal for a 6 cylinder car. The cars with the smaller motors are designed to downshift in high load situations such as steep hill climbing. This is to compensate for lack of torque. It keeps the motor in it's power band so you have the power to climb the hill.

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When driving my 2003 Ford Taurus there seems to be less power when I press on the excelerator and drive my car. It drives but very sluggish. It seems to not have much power as it once did. I checked the...


Why would you mention motor oil & trans fluid,
you should check i,t as well as tire pressure,
but your lack of power can only be resolved
by going through the entire car,testing as you go

You should have a maint log book & know what
was done & when,since you owned it.

If you work on your own veh say so ,otherwise you
need to discuss your veh issues with a local repair shop

Don't just leave it at a shop without going on a road
test with yourself present & spending time explaining
what you want resolved

A tune-up won't do anything but take your money
It is an out dated term
Computers have been tuneing engines since 1980
some 31 years

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You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

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When I come to a stop my Sequoia stalls. When I put it in neutral or park it starts right back up, but as soon as you shift into gear it stalls. If I increase rpms then shift into gear will drive and...


Stalling is normally caused by a problem with
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B) Lack of fuel - the fuel filter/fuel injectors get dirty
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Might want to try cleaning the throttle body. Every 30k miles they should be cleaned.
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It is possible that your clutch is slipping, causing the engine to rev high. Does it also seem to be lacking power, ie if you put your foot ******* the accelerator does it just rev up and not go any faster? If so, the clutch will need to be replaced. Take it to a garage and get them to road test and report to you if you are unsure.
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1998 overheating, and i put cooliant in it?


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