Question about 1992 Lexus Ls 400

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What could cause my engine idol after warming up to start sputtering & jumping from 800 rpm to 400 rpm & so on with no CEL coming on?

If you've read my earlier posts you already know i've been having trouble with my car not running very well & having EC 13 . Well i'm to the point now where i've gotten rid of EC 13 & my car seems to run pretty good @ 1000 rpm but when it warms up & hits 800 rpm then it starts cutting out acting like iy wants to stall until it eventually does stall & i have no CEL coming on @ all. does anyone have any thoughts on this?

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  • 4 Answers

Check you catalytic converter.

Posted on Dec 05, 2014

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Fast idle cold to hot


to fast hot and too fast cold that it?
well here is normal, its a G16 engine, a Vitara with Sidekick badge.
G16 in cold weather, start and race idle at about 1500 rpm
or more if in ALASKA, you never said that or how cold it is.
the IAC valve is thermal, it and opens more colder, a fact.
the 8valve engine (black steel top) is faster. cold idle
then drops in a few seconds, to 1500rpm
at this time, the ECU brain does NOT control idle speeds at all.
the the engine warms up by virtue of the thermostat
as it warms to 150F to on way to 180f stock temp.
the ECU then takes control of the idle speeds.
got that so far?
so at 180f the idle is 800 rpm (800 is hard coded in the ECU,
ad ECU regulates this, unless you turn on the A.C , and if that happens 1000rpm is called up.
if not the ECU cant control it or the ECU is in limphome mode or worse.

if you insert the diagnostic jumper
does the CEL lamp flash 12s
it must.
see this paper clip this is your only scan tool.
it is crude but that is all you get until 1996.

http://www.fixkick.com/CEL/CEL.html#OBD1codes


Jan 04, 2017 | 1993 Suzuki Sidekick

1 Answer

Warning lights not going out


this a 1996 Toyota Hilux??????????
is RPM at 300? or 800,. 300 is bad idle and alt will fail there.
water level, ,
timing belt? (no way on any 96 !!!)
oil level in 1996, ? ahhh you think pressure is level , gotch.
what country is this. ive not seen all 50 country Hilux.s ever.
its not USA car. so?????

check engine RPM
if dash has RPM this is easy, 800 good, lower bad
cold engine RPM is about 1500 and drops to 800 hot.
is this car EFI or CARB, many cars not in USA are carb up to 2001.
to get best help. for all engine issues.
  1. Post your Country, is that so hard,. not one poster ever did.?
  2. Post engine type, most cars have 3 engine options,, land-cruisers 12 engines. world wide.
  3. List all engine related symptoms, misfire , bogging stalls, and engine shaking or low idle RPM or too high,
  4. check all fuse and report the status of the CEL lamp, key on CEL glows, and running stays off. if not insert the check jumper and read the flash codes, CEL on running means the ECU wants to tell you what and why tests fail.. listen to it or fail.

Feb 21, 2014 | 1996 Toyota Hilux

1 Answer

Throttle surge at idol


surge, great post, what engine displacement.
open hood (my answers are USA only) look up, see big white
sticker that is the engine vacuum and type engine sticker)
surge hot or cold? engine.
if it surges hot, that means :
1: ISC system out of control , it job is to stop surge and 5 more things.
2: the engine is way lean and cause ISC to loose control

just 2 reasons, and can be 50 things. wrong.
is the CEL lamp out running> if not, pull the DTC codes and post them. (all)
as a mech ,we find out which it is.
(i make sure my engine can hold closed loop at idle , if not and lean it will surge. (may)
we make sure the ISC works ok (not sticking, clean it)
and then test to see , that if by my forcing it closed, by hand (ask)
i can get way below 800 RPM. most do 500 but 600 is ok.
if rpm stays above 800 closed, that means you have huge
vacuum leak or TV blackage (too thight throttle cable?)

finding vacuum leaks can be horrific, task .
there are many tricks (and tests) to do this, ask.

see that logic above, If I the mech, can not drop rpm below 800
by hand, then no ISC on earth can. not now or ever.
and proves the induction has huge air leaks
or some dolt set the spark timing 20 degrees advanced.
see it.
so as always , a tuneup is first, then as always , i always check timing,and for proper advance rates.
advances engines at idle race way too fast and the iSC will just go NUTS.

ISC = Idle speed controller , that valve that has wires.
the IAC is a thermal device and no wires and it too can stick open
when the IAC sticks open the ISC goes , yes, nuts,
nuts can be surge (ECU is hunting it)
or just racing way too fast hot, say 1500 rpm.
a slow RPm can be a stuck open EGR (50k service point)
lean will cause too low.
too rich , misfires and too low
the ISC is the last thing to work right, all else must be good.

what does your CEL lamp do?

PS: most cars, if the ECU/PCM enters Limphome, it cuts all idle controls. again, the CEL lamp. glowing while running.../????

Nov 28, 2013 | 1994 Honda Civic Del Sol

1 Answer

Ymy battery light came on and everything on dash


shaking?
that means the engine stalled.
when the engine stalls. (do a tune up)
as the engine misfires, grossly , the 4 cyl . engine will shake.
and then it stalls
and many cluster lamps glow, CEL lamp. and charge glow.
you failed to look at engine RPM its wrong.
the normal hot RPM is about 800RPm for most cars.
and the engine EFI brain regulates there.
if the ECU brain can not regulate RPM at 800 that means you have gross misfiring, (lots of causes)
#1 cause, not doing tune ups, (aka, the 60k service points)

Oct 30, 2013 | 2003 Honda Civic

3 Answers

1992 chevy blazer idols too low when engine is cold it idols around 800 rpm but when it warms up it drops down to around 400 rpm n alittle lower when i put it in gear


The problem is in the idle air control motor. It is mounted on the throttle body with two bolts, you can pull it off and make sure it is not caked with carbon also check where it mounts on the throttle body and make sure it is not caked with carbon.

Sep 13, 2009 | 1992 Chevrolet S-10 Blazer

1 Answer

2000 Ford Focus Sputtering / Speedometer Needle Jump


Only 1000-2000 RPM? Does it do that in any gear?

Jun 20, 2009 | 2000 Ford Focus

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