need your HELP please - engine surging
#1
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Location: Arkansas
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need your HELP please - engine surging
I have a 91 ls400 that when it warms up it surges between 800 to 1100 RPM's
So far I have taken the throttle body off cleaned it .
Chances the fuel filter
Changed the air breather.
Replaced the MAF sensor .
No codes
It runs and starts fine just surges oh we also cleaned the throttle position sensor. This thing is driving me crazy !Thanks Danny
So far I have taken the throttle body off cleaned it .
Chances the fuel filter
Changed the air breather.
Replaced the MAF sensor .
No codes
It runs and starts fine just surges oh we also cleaned the throttle position sensor. This thing is driving me crazy !Thanks Danny
Last edited by RA40; 03-02-13 at 04:07 PM. Reason: descriptive title
#6
Lexus Champion
there is a test procedure in the service manual, for both the coil portion and the bearing portion of the IACV
if the IACV tests out fine on both the resistance checks and the correct movement while applying battery power, then at that point I would start looking at ECU caps as a likely suspect.
if the IACV tests out fine on both the resistance checks and the correct movement while applying battery power, then at that point I would start looking at ECU caps as a likely suspect.
Last edited by LScowboyLS; 03-05-13 at 12:09 AM.
#7
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I can unplud it and it don't make any difference . when I unplug the MAF it don't change anything. May be the ECU then but at $2000 dollars that makes to expensive to replace that's more then the Lexus is worth . Lol
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#8
Lexus Champion
ECU's for your model are only $150 on ebay or at the junkyard, although they may require new caps, if yours or one from ebay needs new caps the cost of the parts is only $10 if you know someone who is skilled at soldering in tight places!
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