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Symptoms 1995 cadillac eldorado idle problems ? replaced the ecm a year ago.the idle air sensor (motor assembly ) carran perfect . Next day surging again at idle . next i will replace the tps

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  • 104 Answers

The idle speed actuator has been the culprit. Your P027 code tells you there's probably a problem with the switch inside the actuator. The actuator is a black device, about 3"x2"x2", with a plunger sticking out of it that pushes on the throttle linkage at the throttle body. If you're skilled in repairing small devices, sometimes the actuator can be disassembled, cleaned and lubed, and it'll be fine again, otherwise you'll need a new one, about $125 to $150. It's only held on by 3 little nuts, but one of them is a pain to get to. Also, the nuts are stainless, so if you drop one into a tight spot, you can't fish it out with a magnet.

Posted on Jan 14, 2019

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Posted on Jan 02, 2017

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  • 34 Answers

SOURCE: Locate O2 Sensors in 1994 Cadillac ElDorado

o2 will not make your car do that you have other issues check for secondary ignition miss or primary ignition miss sounds like you are dropping a cylinder dumping raw fuel to contaminate 02 sensor find the real problem to fix your light

Posted on Nov 22, 2008

jgwhomeequip
  • 1902 Answers

SOURCE: Engine cranks excessively before engine starts,even after warmed

Check your EGR valve make sure that is working properly, if it is then go to the fuel pump, just a cheaper fix to go after the EGR then the fuel pump

Posted on Feb 09, 2009

GM Elec
  • 1000 Answers

SOURCE: 1995 cadillac deville "won't start"

When you disconnect a spark plug wire, do you get spark when you crank the engine over?
If so,
When you turn the key to the "run" position (do not crank) do you here the fuel pump run for 2 - 3 seconds?
Let me know.
Regards,

Posted on Mar 27, 2009

  • 14092 Answers

SOURCE: ECM switches from closed loop to open loop at idle after warmup

WHEN ENGINE GOES CLOSED LOOP TO OPEN LOOP.YOU HAVE A RICH FUEL MIXTURE.YOU HAVE A VACUUM LEAK.BY YOU HAVING ROUGH IDLING.AND A HIGH MILEAGE ENGINE I WOULD DO A COMPRESSION TEST OR CYLINDER LEAK DOWN. CHECK FOR LEAKING VALVES AND LOW COMPRESSION .THEY BOTH WILL CAUSE ENGINE TO IDLE ROUGH CAUSE MISFIRE.CAUSE OPEN LOOP CONTAMINATE HO2 SENSOR CAUSE A RICH FUEL MIXTURE.

Posted on Sep 30, 2009

Skorpyo
  • 133 Answers

SOURCE: engine cuts off

If it cuts out after driving a while, one or both fuel pumps are a common culprit. After they warm up, they have a tendency to "fail" for a short while. When they cool back down, they work again. If you don't have any problems caused by lack of fuel while the car is still running, i'd suggest replacing the in-tank pump. If your car lacks power while it's running, your problem is most likely the secondary fuel pump, which provides the fuel system with the higher pressurse required for proper high speed operations. Also, do your fuel filter at the same time, to prevent other problems.

Posted on Nov 04, 2009

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the only component that they sggested you replace that could damage the ecm is the idle air control motor.it is very common for these to short out when they fail and damage the drivers that control them in the ecm.you say you recently replaced idle copntrol motor?did you get it from nissan?if not have it checked for proper resistanc across coils(22 ohms?).alsolook for sign of coolant in valve or valve bore as mounting gasket failure can allow coolant to damage valve.as a rule sensors can not damage ecm only actuators can.another common one on these are the electronic motor mounts.....when they short thy damage ecm.good luck.

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CSP, It sounds like you have a vacuum leak that is causing the IAC ( idle air control ) motor to move in and out trying to control the idle. Check all vacuum hoses on the engine for disconnect, cracked or damaged. If the hoses crack when you bend them, they need to be replaced.
Let me know what you find and we can go from there.
Regards,

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