Question about 1991 Isuzu Pickup
It could be the problem but id also look into the tps sensor thats if it has on since its an older vehicle
Posted on Dec 05, 2012
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Posted on Jan 02, 2017
Do a compression test on all the cylinders and see if the rocker arms are adjusted to the right. If the compression is bad then there will be no power at all and if the Rocker arms need adjustments you could be losing some power there too.
You can try cleaning out the engine from the inside out. I have done this many times when I buy a use car. I run Marvel Mystery Oil with the engine oil for about 4 months and keep an eye on the oil level. Marvel is a thinner oil and clean out the inside by removing the carbon collected and oil sludge inside the engine.
You may end up having to replace the oil pressure sensor, it seams to always be the first to go bad and may get some oil leaks. But once the engine is cleaned up you'll have a better understanding on the condition on the engine and be surprised on how well it runs after.
Just keep an eye on the oil level and change the oil and filter to free up the engine, then use the recommended oil and add Lucas oil and or Restor to help the loose of compression.
The loud tapping tells me that your not getting the oil to the top of the engine and that may be a bad oil pump but it may also be a plugged oil pump screen and the Marvel Mystery oil will clean up the oil screen.
Good luck and hope this helps, Keep me posted on your Rodeo.
Posted on May 22, 2009
There is no transmission dipstick. You have to both check and add fluid to these vehicles from underneath the vehicle. Find the transmission fluid pan and you will find two plugs. The lower plug will drain the pan and the upper one you can add fluid or check the fluid level. You will know that the level is correct when the plug is out and fluid barely leaks out of the hole. You don't want a lot coming out because you don't want to overfill. In order to get it into the hole you have to be some sort of tube to attach to the top of the bottle. They sell these types of tubes at your auto part store and they just screw on. It is very awkward, but you can actually put the bottle high enough to get the fluid in if you put it right to the left of the pan. The first time I did this on mine it was a pain but once you figure it out you will be good to go. Let me know if you have any other questions about your vehicle. Thanks for rating my response and for using FixYa!
Posted on Sep 05, 2009
I have a 91 pickup with the 2.3 engine. The problem that you are having is likely the same problem I have - and it is caused by the Mixture Control Valve. It is a white plastic barbell shaped device in a holder on the inside fender wall. There are two vacuum hoses going to it - one small diameter and a larger one. Air enters the bottom of the valve and is drawn through the larger hose. The amount of vacuum on the small hose regulates the amount allowed through the large hose. I haven't found one at a parts store nor have I found one in a junk yard just yet. The Isuzu dealer can order one, but as the parts guy said, "Isuzu is very proud of their part". It costs about $150. If you want to check yours, there are several things you can do: first, run the vehicle and put your hand under the valve - it will **** a lot of air all the time. You can pull the valve off the truck and pry the bottom off the housing. You will probably see the same thing I did - broken pieces that used to stop the air flow through the valve. Until you get a replacement, you can try what I did: 1. Pull the small vacuum hose off and let it lay loose, or 2. Pull the small vacuum hose off and let it lay loose AND block the large hose (or the bottom of the valve). In either case, you have to adjust the fast idle screw and/or mixture screw on the side of the carburator. If you adjust either screw, write down what you did, in case you get a new valve later. The diference between 1 and 2 is that 1 will run good once it is warmed up but will want to stall until it warms; 2 runs good both when cold and warm, but will idle faster than it should. Neither of these will make the truck run like it should, but it is a 100 times better than trying to drive it with the loping.
Posted on Dec 13, 2009
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