Outer Limits 4x4 Board

Need some input with my 1uz. Please give me any thoughts you have that might be the problem. If I am to take this POS for its first run this weekend I need to get this problem sorted tonight and everything else is done and ready to go

Motor starts after a few goes, idols perfectly, try to rev it and it goes good up to approx 1500 - 2000 rpm, then it coughs, splutters, tries to back fire and tries to stall, lift foot off go pedal and it comes back to idol but then it is hunting up and down in its idol revs. Oh and you can smell the fuel which means over fueling to me.

sounds like it losing spark what are your plugs like pull them out and see what colour they are they could be fouled or just not getting spark. not to sure on the engine but it could be a coil or crank/cam sensor. or in the dizzy. but ild check the plugs first the change them if the black or sooty them try it agian

I have no idea what type of engine you have GUTS but when i had my street cars,i had a similiar sounding thing happen to me,i was running a Mallary duel point dizzy. Problem ended up being in the dizzy,pulled the duel point out put a stock dizzy in and went OK.

Another thing silly i know but check to see if all plug leads are on.

Given you have just put the Lexus in start by checking you have good earth straps on the block as well as the chassis, battery terminals, check the coil packs are all secured nice and tight, then check plugs etc. also check all the sensor connections are clicked in properly and make sure there is no moisture in them. Does the computor have an earth wire as well ? some do.
I know this is basic stuff but it can be overlooked some times.
Good luck.

Yes some coil packs use the mounting for the earth .

Larry

wat engine is it , do you mean an isuzu, if its a diesel, it sounds like fuel check the fuel filters, ive found that on a diesel we had it copped a load of bad fuel and clogged the primary an secondaries, which starved the supply, as soon as changed, it pulled another 350 rpm

just a quick thought

Have you checked to see if your ignition is advancing? Can't imagine why it wouldn't be, but symptoms could be as you describe.

Hook up a timing light.

Cheers,

Scott

Guts,
Is it factory ECU? If so, which car is the motor out of?? A mate has a 1UZ/auto out of a 1991 Celsior (LS400 here) in his MX83 cressida. It has factory wiring and ECU. When either in park OR neutral, the ECU will not let the motor rev past 1500-1700rpm, and it sounds exactly as you have explained it. The neutral start switch also incorporates an rpm triggered switch that cuts the spark when trying to rev in neutral/park. This is so the Japs couldnt do the old "neutral-5-drive" trick, and destroy the electronic autos. If the neatral start switch to the ECU is not bypassed when hooked up to a manual box, what you are explaining is exactlry what it will do

If you have an aftermarket ECU, then disregard what i just said

sounds like fuel staving, blocked filter/line or an air leak?

I got a Crown half cut, these have the sepperate ECT and ECU.

It is over fueling lots.

Oh and for those of you that don`t know it is a 1UZ-FE, Toyota 4lt V8, yes a lexus motor.

have you touched the fuel system, most fuel injection systems need bleeding after you change the filter, and it is common to get an air buble in the rail near the injectors, it will idle fine but wont rev. my rover had that prob,

Could possibly be the oxy sensor in the exhaust. The hunting up and down at idle is what happens when they fail and also the over fueling as the computer goes into full rich mode as it can't get a proper air/fuel signal any longer.
It's probably one of the cheaper things to change if that is the problem.
Regards Andrew

Unplugging the AFM doesn`t seam to make much differance so at this stage we think this might be the problem. Have given up for tonight and will be back on it tomorrow.

I have a spare computer if you want to borrow one guts....

Computer is fine, need an AFM but.

I can come around and help and you could borrow mine, but I am up the coast this weekend, an evening next week would be OK...

Also guts, have you seen any 4.3L VVti motors available?

Thanks dude for the offer but I`m not exactly just around the corner, I`m in Albury.

You do have the intake pipe between the Airflow Meter and the intake dont you?

This guy i know was trying to get his buggy going and it was doing similare things. He said to me all the wires were hooked up right. I went and had a look and he had the Airflow meter just sitting on top of the motor with no intake piping hooked up to it. Ask Adrian about it im pretty sure he was there

Make sure you have no Air Leakes after the Airflow meter.

Sounds like MAf (airflow) or
Faulty Lambda (oxygen)
Plus as steted earlier a lot of Computers wont allow you to rev in neutral.
But if yours is overfuelling then above OR Fuel Regulator in rail is suspect

Good luck

Bazzle

Its all ok, got a new AFM today and it now works sweet as. I had to drive to Melbourne and back and the only one I could find cost me $300 but I don`t care as now my hilux IS going for a drive. We were leaving today at 2pm, now we are leaving tomorrow morning about 6am.

Thanks everybody for your help.

Oh and I find a 2uzfe in a 100 series with only 10,000kms on it, they want 9g for the motor loom computer etc. I`m thinking 80 series

Guts wrote:Its all ok, got a new AFM today and it now works sweet as. I had to drive to Melbourne and back and the only one I could find cost me $300 but I don`t care as now my hilux IS going for a drive. We were leaving today at 2pm, now we are leaving tomorrow morning about 6am.

Thanks everybody for your help.

Oh and I find a 2uzfe in a 100 series with only 10,000kms on it, they want 9g for the motor loom computer etc. I`m thinking 80 series

Cool might come for a drive to the bottom of MT lindsay for a beer then tommorow night.

RUFF wrote:You do have the intake pipe between the Airflow Meter and the intake dont you?

This guy i know was trying to get his buggy going and it was doing similare things. He said to me all the wires were hooked up right. I went and had a look and he had the Airflow meter just sitting on top of the motor with no intake piping hooked up to it. Ask Adrian about it im pretty sure he was there

Make sure you have no Air Leakes after the Airflow meter.

Tony as you know I don`t know much about motors but not even I am that dumb