I have a 1998 isuzu rodeo and yesterday while cleaning it I had the radio on and after a while I notice the radio started going off and on. Then this morning when I tried starting it it would not started. What could cause this?

Question edited for clarity, written English, typos and abbreviations
Question moved to model category.

https://en.wikipedia.org/wiki/Isuzu_Rodeo

Look like the design change was later, but 1998 might be iffy unless your 1998 was made in 1997.

Isuzu North America also offered a three-door version under the name Isuzu Amigo, sold as the Isuzu MU in Japan. A second generation of the SUV was released in 1998 for the 1998 model year, with the three-door Amigo becoming the "Rodeo Sport" in 2000 for the 2001 model year.

You can also compare parts.
1994

https://www.google.com/search?q=1994+Isuzu+Rodeo+bonnet

1998

https://www.google.com/search?q=1998+Isuzu+Rodeo+bonnet

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Yes. When you replace the master cylinder the fluid needs to be flushed also.

I hope this helps.

it cold e the rings on your pistons not allowing compression cause it was lying in one position all the time i would clean plugs and spray a little oil into cylinders this will increase compression slightly and she might fire once she runs she will be okay then

If you have the radio codes you can sipmly disconnect thebattery for 15 seconds.

have what on?

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.

I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.

CLICK on the following 2 LINKS. They have the Serpentine and Timing Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies:
For the Serpentine Belt:
http://www.2carpros.com/car_repair_information/year/1998/make/isuzu/model/rodeo/1998_isuzu_rodeo_drive_belt_routing_diagram.htm
For the Timing Belt:
http://www.2carpros.com/car_repair_information/year/1998/make/isuzu/model/rodeo/1998_isuzu_rodeo_timing_belt_diagram_marks.htm

this is the oxygen sensor is time to replace it thank you

I'm assuming its an original alarm or system that came from factory or dealer. When the light blinks is because the alarm is activated. Look underneath the radio the alarm brain might be there. There will be a label on it saying alarm or security system etc. Disconnect the harness to it and try operating your vehicle.

You've probably worn the battery down, and I would guess by the age of the vehicle, the battery you have is on it's last leg.

Have someone jump start you, and get the battery checked/replaced. Any battery over 3 years old should be suspect.

Hi..I have a 1998 Isuzu Rodeo also...The problem is you need to replace the starter or rebuild it...It's best to just buy a new starter..Trust me on this..I had the same problem and did everything you did and more..From the research I had to go thru it's just best to buy a new one with a warranty..Just some advice if you do this yourself..The down y pipe on the exhust will have to be removed to do so..you must spray the bolts with wd-40 or pb blaster and let it soak over night...If not you will pull your arm out of it's socket trying..Also jacking the car up until the front driver side wheels are way up of the ground, This will give you a little more room to use a breaker bar to pop the nuts loose..I hope this helps you..Good Luck!!