Question about 1990 Lexus LS 400

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My exhaust pipes are glowing hot

I have just purchased a toyota celsior (ls400) 1990 i was driving a short distance and the car seemed to loose power as if it stoped firing on some
of the spark plugs then the exhaust pipes at the back of the engine just below the firewall began to over heat and glow red with heat somebody
told me there is an ignition coil that sometimes fall off the engine i would
like to know if anybody has had this problem and can they tell where this
coil is located and also will i need to replace mt catalytic converters

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  • jack369 Jul 11, 2008

    thank you for your advise



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  • 321 Answers

The catalytic convertors are no good.They are severely restricting flow.Do not drive until repaired.The car could burn,or damage to the engine could result.

Posted on Jul 10, 2008


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Lost power in celsior v8

what country
4.0 L 1UZ-FE V8 its a fuel injected V8. used in Lexus LS400s in USA.
i restore old cars and 1990 is old.
lost power can be misfire , does it do that hot /cold or both engine temp? loss power, under what coolant temps.
so if the tranny dont slip or brakes drag. (car rolls easy) then
the engine is sick , this is an EFI engine.
on all old engines. Get a real FSM, for sure.!!!
  1. check compression, first. 150psi or more. good on all 8 (W.O.T)
  2. tune it up, wires plugs, cap ,rotor.. filters. (all)
  3. Ignition timing: 8 -12deg BTDC @ idle (Transmission in neutral position)? 1-8-4-3-6--7-2, firing order sparks wired right?
  4. I then make sure fuel pressure is at spec,
  5. at the same time. the classic injector leak down test.
  6. at the same time, the classic, injector balance test.
  7. With all that good the EFI system has hope.
  8. I then check the ECU for DTC errors, (flash codes )an address all those.
  9. the eng. thermostat get to 180F or more fast and holds !!!
  10. if clean the MAF a dirty MAF, will cause lean and lean causes bogging and huge loss of engine power
  11. does the engine hold closed loop. at idle and at 2500 rpm in neutral (hot engine) id bet not.
  12. no scan tools so all you have is a blinking CEL lamp test so do that check. The check jumper wire.
  13. on these old dogs, i must check every sensor by hand due to no SCAN tools in 1990
  14. thats enough, for now. I see wasted spark coil packs, got misfire?

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