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Amedee, Former ASE Master Tech
Category: Car
Satisfied Customers: 26269
Experience:  ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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isuzu rodeo: bump..looses power..goes down..20 miles per hour

Customer Question

My Izuzu Rodeo 2001, the engine light is always on
and when I go through a bump or rr the transmition light and the cruise control light will go on at the same time also the car will turn off .in other ocasion looses power and goes down to 20 miles per hour. help me please!. thank you . jose from tampa, Fl.
Submitted: 7 years ago.
Category: Car
Expert:  Amedee replied 7 years ago.



Do you know the code number in the computer?

Customer: replied 7 years ago.



Expert:  Amedee replied 7 years ago.
I thought you said that the mechanics looked at it?
Customer: replied 7 years ago.
Expert:  Amedee replied 7 years ago.
Did they plug into the computer?
Customer: replied 7 years ago.
yes, nothing shows
Expert:  Amedee replied 7 years ago.
I thought you said the check engine light is on?
Customer: replied 7 years ago.
yes, is on all the time
Expert:  Amedee replied 7 years ago.
Then there should be a code in the computer.
Customer: replied 7 years ago.
please give me a minute im trying to find the code on the computer, can you tell me where is located.
Expert:  Amedee replied 7 years ago.
The code? Just turn the key on, plug into the ALDL and read the codes. You might have to go under codes depending on what code reader or scanner you have.
Customer: replied 7 years ago.
im trying to take it out to see the code
Expert:  Amedee replied 7 years ago.

Ok... take your time!


Let me know!

Customer: replied 7 years ago.
small 80 1171 L25447 blue small 41
Expert:  Amedee replied 7 years ago.



Is this a P1171 code?

Customer: replied 7 years ago.
the only numbers were 80 1171. no p
Expert:  Amedee replied 7 years ago.
the 1171 number looks familiar. But I don't know what the 80 is.
Customer: replied 7 years ago.
do you know what's wrong with it or need more info
Expert:  Amedee replied 7 years ago.
P1171 Fuel System Lean
Base engine "mechanical" fault affecting one or more cylinders
Check for air leaks in the exhaust manifold and in the exhaust pipes
Fuel injectors (one or more) restricted (allowing too little fuel)
Fuel delivery system supplying too little fuel during acceleration periods (e.g., faulty fuel pump, dirty or restricted fuel filter)
Fuel control sensor out of calibration (i.e., IAT, MAF or MAP)
HO2S has failed (it may be contaminated with fuel, silicone or water)
Vehicle driven low on fuel or until it ran out of fuel
Amedee and 5 other Car Specialists are ready to help you
Customer: replied 7 years ago.
i'll try those sugestions and see if any of those work. i'll keep you posted once we get it fix. thank you for your patience and help.
Expert:  Amedee replied 7 years ago.

Thanks for the accept!


It sounds like you just have a simple lean code. This is usually caused by a vacuum leak or a bad mass air flow sensor (if equipped). Just open the hood and look for a hissing sound when the engine is running.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow.
If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this!

Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush. Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.


Check for the following conditions:


Poor connection at PCM or IAC motor. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage.
Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter element, or foreign objects blocking the air intake system.
Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the IAC pintle, and excessive deposits in the throttle bore and on the throttle plate. Check for a sticking throttle plate. Also inspect the IAC passage for deposits or objects which will not allow the IAC pintle to fully extend.
Vacuum leak. Check for a condition that causes a vacuum leak, such as disconnected or damaged hoses, leaks at EGR valve and EGR pipe to intake manifold, leaks at throttle body, faulty or incorrectly installed PCV valve, leaks at intake manifold brake booster hose disconnected, oil filler cap, oil level indicator loose or missing, etc..



Edited by AMEDEE on 12/1/2009 at 3:49 AM EST