Question about 1989 Cadillac Allante

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1989 Allante idles great @ start up,then when it wars up starts missing. Recently had a complete tune up. Car has 28,000 miles

Replaced wires,new plugs,dist cap,& rotor. Didn't help. Still has same problem

Posted by Anonymous on


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Posted on Jan 02, 2017

  • 319 Answers

SOURCE: 1991 eldorado lack of power,

check your rotor under your distributor cap if you have one. That should be replace. Also did you check your mass air flow sensor. you can buy a special spray to clean it out. Do you have a throttle body, if so it is so easy to pull and clean it out. Check your throtle body sensor.

there are a lot of auto part stores and garages that will do free computer checks now. Take advantage of this.

your definately on the right path, just keep digging. Also does your car have a turbo, this could be your problem.

Posted on Jan 31, 2009

  • 3113 Answers

SOURCE: 1989 Deville 4.5 TBI No start condition

A faulty map sensor will make it run rich and so will a bad or misadjusted TPS but it should try to crank. Check mat sensor. A stopped up converter will do this to.

Posted on Apr 28, 2009

Testimonial: "Stopped up converter thanks"

  • 3113 Answers

SOURCE: Surge. loss of poert. backfore exhust, intermuttent, iy will also rin like a new csr fro 100 miles at times.

Check map sensor and vacuum hose going to it. Check tps for binding or sticking. Is tps adjusted correctly? What are the codes? This car has an on-board diagnostic center that you can check all of this while sitting in the car. Fuel pressure should be 9 to12 psi. according to service manual and you need to hook it to a gage for that. . Check timing, it is a certain procedure to set timing on this car that involves going to a "set timing mode" on the diagnostic panel and crossing some connectors. You can also set the tps with diagnostic panel readout. Check for water in fuel system. Check egr ports and vacuum supply, to egr valve also egr solonoid.

Posted on May 20, 2009

  • 1608 Answers

SOURCE: engine miss,replaced fuel

Do a compression test and make sure it is not a mechanical problem.Could be burnt valve,bad cam,or broken valve spring.If you know which cylinder is missing pull the valve cover and check the valves and see if they are all moving up and down evenly when you turn the motor over.Just disable the vehicle from starting or you can do it with it running.Hope this helps.Good luck.

Posted on Feb 18, 2010

  • 173 Answers

SOURCE: dash codes on my 92 cadillac sedan deville are

throttle position sensor replace it. also in rare cases the map sensor will be bad . go to a junk yard and get your replacements it wont cost near as mutch. compared to the retail stores

Posted on Apr 03, 2010

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2. Do a complete tune up. New plugs, new plug wires, new air filter, new fuel filter if it has not been done recently.

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