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  #16  
Old 05-27-2018, 03:11 PM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Hey guys, don't worry I didn't drown in all this rain, the idle is sitting right at 800-900 and all the power seems to be there. In addition, whenever I start the truck I have to turn the key two or three times before it turns over. Sometimes I have to give it a little gas, it's easier to start if the hard idle screw is turned in a little. All in all it is a lot better than it was.

However, since I changed the thermostat it is no blowing hot when I put the heater on. I currently have a flush in there with distilled water so I was thinking maybe it just isn't transferring heat properly but the heater hoses aren't even warm after running the engine for 15 minutes with the heater full blast. I squeezed the top hose, made sure it is full to the top, still no heat. The heater blew hot before the flush, blew warm during the flush, now it is cooler than the ambient air almost. Ugh - should I start a new thread?

Last edited by ASchell90; 05-28-2018 at 05:24 AM.
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  #17  
Old 05-28-2018, 04:14 AM
tomw0 tomw0 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

I would suggest searching for 'bleeding the heater' as I think you have air in the heater hoses & heater core.
tom
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  #18  
Old 05-28-2018, 11:05 AM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

So, I burped the system because I couldn't find a thread on specifically the heater hoses themselves. I idled it and turned the air all the way to hot, the fan on high, and I pressed in the dial for A/C. The air blew ice cold and I saw condensation around the A/C lines so I unpressed the dial and let it idle with only a marginal improvement. However, I took the truck up the road and back and as I was driving it started to blow very hot. I got gas, got back in, and the heater blew cold again. I drove home and it started to blow hot. Both the heater hoses are hot, I'm not sure how to bleed them but I idled with the radiator cap off for a while and kept it completely full so I would assume that would work all the air out of the system.


It wont start up on the first try, it takes two or three attempts and I have to pump the gas a couple times. The idle is still strange as well. It idles at 900 and seems rough. The engine shakes back and forth while idling, not violently but the whole car shakes a bit. It also surges a little and slows down to almost stalling for a bit until it corrects itself and stays steady. The rumble is persistent throughout. In addition, when I parked it I could hear a slight ticking/tapping sound which sounded like it originated from the lower drivers side of the engine. It doesn't sound ominous but Im not familiar enough with engines to know what that sound could be caused by.

So to recap I have a new EGR and IAC on it as well as new coolant temperature sensor and thermostat. It has new spark plugs and wires. I can't find any vacuum leaks. The idle is much better but it still seems like there is something wrong with it. I unhooked the battery cable and I'm gonna let it sit until my next day off. Any ideas for my next step? Thanks for your help!

Last edited by ASchell90; 05-28-2018 at 11:41 AM.
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  #19  
Old 05-28-2018, 10:13 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

And there is no [CEL] on at this time either correct?
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  #20  
Old 05-29-2018, 03:25 AM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Nope. I haven't seen one since I got the truck back - come to think of it I have never seen one on this truck.
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  #21  
Old 05-31-2018, 12:20 PM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Here is a video so you can get a better idea of what I am seeing.


Sorry about the quality. Not sure what I am even looking for at this point lol.
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  #22  
Old 06-01-2018, 12:05 AM
Undrstm8ed Undrstm8ed is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Sadly the gauge is [somewhat] static, so as long as its good temp wise it should stay somewhere in the middle more, sometimes less from my experiences.

When you turn the A/C on it dips in RPM and clatters? Have you tried temp Removing the belt and spinning the A/C clutch by hand? Power steering Pump? Just trying to pin point where the dragging clatter is.

And when you pull the IAC, typically if I recall, RPM's should go up, not down... Symptoms are very similar and for $35 on a 26 yr old truck, worse case scenario.. its good for another 20 years.

But: You can check the health of the valve by checking its resistance. When you disconnect the IAC valve, connect an ohmmeter to pins 2 and 3 of the valve. If you get a resistance value between 10-14 ohms, it indicates a functional IAC valve. Now, connect the ohmmeter to pins 1 and 2. If you don't get a resistance value between 10-14 ohms, this means, the IAC valve needs a replacement.


https://wheelzine.com/symptoms-of-ba...-control-valve

https://www.rockauto.com/en/catalog/...ac)+valve,6072
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  #23  
Old 06-01-2018, 04:52 AM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Yeah, the gauge seems that way but at least I'll be able to learn to read it. If it ever gets to the hot side I know my engine is probably engulfed in flames. I will take the belt off and check tonight after work. I'm leaning towards the ac clutch because that is the one that is squeaking if I recall correctly. I actually replaced the IAC, that is a new one on there right now. It's weird because sometimes it will drop the idle, sometimes it stays the same, sometimes it might go up. It's like the computer isn't sure what is going on at any given point. I'll still check it just to make sure.

The new problem of having to turn the key three times to get it started is bothering me, never had a problem before I reset the hard idle screw but now I have to pump the gas and try multiple times before it turns over. Might change the fuel filter just because it's probably the original one. Thanks for the input, much appreciated.
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  #24  
Old 06-01-2018, 05:16 AM
tomw0 tomw0 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

I have not watched nor listened....

If you have to cycle the ignition a few times, you likely have a drainback or leak(internal) problem. Cycling the key runs the fuel pump for 3-5 seconds on each ON cycle. You are priming the injectors & fuel rail & fuel line by running the pump.
The pressure should stay up after shutdown, but if the check valve in the tank, or the injectors are leaking, the pressure will drop, and you'll need to cycle the key.
If it starts and runs fine after cycling the key, the leak is likely the check valve built into the fuel pump sender assembly. They can be replaced, but you'll need to remove the bed or drop the tank. Bed removes easier, FWIW.
The IAC, if disconnected, will allow the throttle plate to close until it(mechanism) rests on the hard stop. The engine should stall if the IAC is unplugged.
The tests for IAC are more observation than anything. If you get a higher idle when first starting a cold engine, the IAC is doing its thing. If the idle doesn't drop when the A/C clutch engages, ditto. Same if you turn the steering wheel while at idle, sitting still. The PSPS, Power Steering Pressure Switch, will closee @ high pressure, and if the engine is idling, the computer may kick the rpms to prevent stalling.
If the IAC does all this, it is functioning properly.
Check the CTS and ACTS - coolant and air temp sensors - for good values. Check the MAF for clean wires. Check the bellows on the air tube for cracking. Check for loose or compromised vacuum lines. Make sure the EGR is CLOSED at idle.
tom
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  #25  
Old 06-05-2018, 04:15 PM
ASchell90 ASchell90 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

Thanks again for all the help guys. After running the truck around town it seems to have found a good idle, it is right between 500 and 900 and sounds alright so I'm pleased so far. The heater blows hot while driving and still doesn't blow hot while idling so I'm hoping I didn't block the heater core or something when I did the flush but both hoses get nice and hot so not really sure what's up with that. I'm in Florida so if it's not the water pump or something I think I'll wait to explore options. I'm gonna keep burping it though in case there is still air in it somehow.

I narrowed the squeaking down to the ac compressor pulley - chirps at idle, whines when the ac is on. I took the belt off and the ac pulley rotates. The auto parts place guy said I need to try it under a load - not sure how to - and then told me I need to replace the whole compressor or bypass it so it doesn't snap the belt. Seemed a little excessive, can't I just pull and replace the coil, clutch, and pulley? Not really gonna worry about it for now unless it is as bad as he made it out to be.

For now I have to focus my finances elsewhere so any last tips or tricks you might have would be appreciated. Thanks again for the help, wish me luck!
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  #26  
Old 06-06-2018, 03:44 AM
tomw0 tomw0 is offline
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Default Re: 1990 2.3 High Idle and Drinking Gas

When the compressor is not being used for A/C, the pulley and bearing rotate independent of the compressor. If you get noise and squeaks with the compressor idle, it is in the bearing/clutch assembly, which can be replaced w/o messing with the A/C.
tom
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