Question about 2003 Cadillac Seville

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2003 Cadillac Seville starts fine seems to sit and idle fine but when you give it gas it wont rev up has for rpm and when you're driving it if you really push it hard you can get up to maybe 60 65 miles per hour but it acts like it doesn't want to shift I hear that noise that comes from the trunk area don't know if its the fuel pump or I thought it was the air shocks but not sure

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: Will not rev over 2000 rpm 2003 hyundai santa fe 2.4 eng

get someone to rev the car and see if the exhaust note sounds muffled!!! i.e blocked or bent if it sounds normal chech fuel pressure and more importantly fuel flow the guy with air flow meter was proberbly right
regards ray w QLD OZ

Posted on Apr 06, 2009

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Molson02536
  • 3854 Answers

SOURCE: Blazer transmission not shifting properly beetween 1 and 2

Your going to have to get the ECM scanned, Auto Zone scan's for free and most garage now will scan for $10.00 to $15.00 since they all have the scanners now and need the business.
You could have a Vehicle Velocity Sensor (V V S)  going bad or the wire harness it self. The V.V.S tells the ECM how fast the drive shaft is rotating and calculate's what gear it should be in relative with the engine speed and throttle position, and transmission fluid pressure.
Regardless you need the Blazer scanned to pin point why your transmission is shifting the way it is. Could be as simple as time for transmission oil and filter change for $125.00 or a loose wire harness.
Check your transmission fluid and try not to run the blazer to hard, to replace the transmission start at $1,900.00 for a rebuilt.
Good luck and hope this helps. Keep me posted

Posted on May 26, 2009

  • 35 Answers

SOURCE: My H2 2003 hard or take time to shift when running to 35+ MPH

check your tranny fluid and filter. you may have a clog some where or could be low on tranny fluid.

Posted on Jul 25, 2009

  • 10 Answers

SOURCE: 1999 dodge durango is hard to start. Starts with

FIrst have you tried giving the engine a tune up (ie replaced the spark plugs)

Also you need to check the condition of all the vacumn lines on the engine loss of vacumn can cause poor idling.

Posted on Aug 16, 2009

inkedsgt
  • 359 Answers

SOURCE: 1999 cadillac seville sls it over heats when in drive

how many miles are on it? if you have over 70k the head bolts may have let loose and allowed the head gaskets to leak they all do it

Posted on Nov 30, 2009

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1. Verify the exhaust system is not plugged. Check for less than 1.5 PSI backpressure at 2,000 RPM in park, or open the exhaust before the converter.

2. Check the Manifold Absolute Pressure Sensor (MAP) for 4.8-5.0 volts Key On Engine Off (KOEO) and about 1 volts at idle.

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