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99 trouper has lost its idel control has new everything, 99

Customer Question
99 trouper has lost its...
99 trouper has lost its idel control has new everything
JA: What is the make/model of your car?
Customer: 99 isuzu trouper 3.5
JA: Are you fixing your Trooper yourself? What have you tried so far?
Customer: injectors idle control motor fuel pump engine is new crank sensor
JA: Are you certain it's the fuel pressure sensor that's in need of attention? What about the fuel rail? Have you checked it yet?
Customer: new fuel regulater ye fuel presure is on
JA: Anything else you want the mechanic to know before I connect you?
Customer: nope guess not new ecm as well
Submitted: 4 months ago.Category: Car
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Answered in 14 minutes by:
7/27/2017
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Car
Satisfied Customers: 4,153
Experience: Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic Vehicles
Verified

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Customer reply replied 4 months ago
ive tryed everthing with this i have lot of car repair been shop 1987 on
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

hey how are you

This one will requires some back and forth between us

1-What is our fuel pressure

2- TP sensor replaced

3- Test that tps circuit

4- IF YOU UNPLUG MAF WHILE RUNNING DOES ENGINE STUMBLES OR NO EFFECT

CLICK ON LINK TO VIEW

LETS START HERE & WE GO FROM THERE

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Customer reply replied 4 months ago
there is no vacume leaks and if you keep it running it goes to2000 and it had new maf put on it all ready and proper maf signal is reaching pcm
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

What is the fuel trim reading ,long term and short at idle at operating temperature ?

what is tps voltage at idle and at WOT ?

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Customer reply replied 4 months ago
its asking for fuel ill go check tps full volt but it did full graph with out drop out
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

IAC VALVE & IAC SYSTEM TEST

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Customer reply replied 4 months ago
it will not idle it rev up then drops its self dead and then if you peadal goes high the stays there fuell pressur is at spec
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

EVEN WHEN U REV UP STAYS AT SPECS ?

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Customer reply replied 4 months ago
its all new pump filter regulater injectors and the engine is brand new
Customer reply replied 4 months ago
iac is new and funtion
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

Have you done s simple TB relearn

Switch on ,wait 30 secs, switch off wait 30 secs , switch to start and let idle ,any changes

then if fuel is good, you have tps or iac or a bad ECM or wiring in between

what is the tps voltages ?,does it go from 0.5 at idle to 5 volts at open throttle? is the ecm receiving tps sensor input ?

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Customer reply replied 4 months ago
i had tryed run dual trace and had bad crank sensor pattern but changed it and no change
Customer reply replied 4 months ago
it reads on scaner as it is just percentage
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

I need fuel trims

i need tps voltages so I can figured out for you why , if you say fuel is good

can you get that

do you have a capable scanner read live data ?

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Customer reply replied 4 months ago
i have had it on and off million times this is somthing strange yes i have scan to read it live be right back
Customer reply replied 4 months ago
if i keep it running i have 99.2 short term and 23.2 long term at 3.5 percent tps
Customer reply replied 4 months ago
hear is somthing else is if i feed it with carb spray it will stay going
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

okay ,I will try help you

but i need these readings to start narrowing down ,

do a continuity test on the wiring between tps and ecm that ,that is where i start if no power is there or erratic signal not let tb learn idle ,

you are obviously missing something and been throwing parts at it ,we all do sometime :)

but in this case you start from scratch

the 23.2 long term you are adding fuel like crazy , 25% is max

we can add fuel because of fuel component if fuel related or we have a vaum leak and ecm adding to keep af ratio ,which on is it

you are missing something here

3.5% tps even at wot ?

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Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

we have a fuel issue ,

do we have vacuum on fuel regulator

read the fuel pressure again , i had some case the fuel tester gauge u have could be reading wrong check the valve stem in the gauge

when you spray u helping it from fuel

i bet you the short term fuel trim will drop down when u spraying ?

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Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

we need to narrow it down , is it fuel or tps electrical ?

if fuel pressure is low the tps % want rise since the ecm want commanded since it sees a low fuel or to much air condition ?

let me know

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Customer reply replied 4 months ago
no it goes 100 percentage at full throttle
Customer reply replied 4 months ago
i have plenty of fuel availble car will turn rpms fast and hard no delay it not them things im not that dumb bad speeler but not car dumb
Customer reply replied 4 months ago
its not getting fuel for some reason what abut low voltage at injectors or somthing
Auto Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 4 months ago

in this case will opt out for other expert to assist you on it since you can not answer my questions therefore i can not help you further, maybe other expert can

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Customer reply replied 4 months ago
what are you talking about
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