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Old 04-08-2021, 05:32 AM   #1
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Hey everyone!
First time here! And am grateful for any input yíall have!
I have for the last 8 months been workin on my 95 hardbody 4x4. After a long while of dealing and sorting out the big and little gremlins Iím down to one question.... why the hell do I have only one green light on my computer!!! The idle is a bit rough I have replaced the mass air flow sensor and that made it a bit better. Also the O2 sensor. I have checked all of the injectors and they are fine. I canít seem to find any vacuum leaks. Even though itís almost acting like there is one... I checked all the codes and have replaced and fixed what needed replacing. I cleared all the codes so my check engine light is no longer on. I drove it around and it was driving great but at a stop light once it was just idling it would go from 1200rpms to 900rpms back to 1200... just sort of fluctuates... HELP ME!! What am I missing?!
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Old 04-08-2021, 01:50 PM   #2
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When you checked for vacuum leaks did you check the mounting surfaces between the head and the intake manifold? I had a pretty bad leak there one time
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Old 04-08-2021, 02:45 PM   #3
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Intake leak between the MAF and the manifold?
If it has an "AB valve" they can cause fluctuation like that if they are malfunctioning.
Vacuum leak in the power brake circuit? Plug the line near the engine to rule it out. A leaky booster or fitting is all in takes in a big line like that.
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Old 04-08-2021, 04:21 PM   #4
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Thanks for responding! Yesterday I took the throttle body off and put gasket sealer on both gaskets. The one below and above the mounting spacer bracket. I thought maybe it was coming from there but after tightening down everything again. It didn’t seem to do anything and the spacer bracket doesn’t seem to be warped. I will look into the booster... I did plug the vacuum line to the booster but maybe I didn’t clamp it good enough... I will let you know my findings! Thanks again!
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Old 04-08-2021, 04:30 PM   #5
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I will double check the connection between the intake and the head as well... but when I spray any cleaner around the area it doesn't seem to change the idle. but I will check this this afternoon!
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Old 04-08-2021, 05:22 PM   #6
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I mentioned the intake hose because yours is a 4x4. If it has body lift, that can get pulled at an unnatural angle, leading to a leak that confuses the MAF sensor.



I mentioned the AB valve because you said it was surging? The Air Bypass, or Anti Backfire valve as it is known, may get stuck open, allowing it to gulp lots of air when it is not supposed to. Reference part 14835 in this diagram:


Do some searching for how to test it. IIRC you should be able to blow through it one direction, but not the other. Then you apply vacuum to the small tube and it opens up or something. I'm sure it's n the manual.




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Old 04-08-2021, 05:40 PM   #7
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the truck does a body lift so I will check the intake hose and also see if I have a AB valve. I'm not sure... I will let you know my findings...
I have a 4 cylinder engine and it also has a EGR delete from the previous owner.
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Old 04-08-2021, 08:56 PM   #8
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Welcome to the site.
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Old 04-09-2021, 04:19 AM   #9
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So looked into everything today and had no vacuum leaks. Also did not have a AB valve. What I did find is that my intake air sensor was completely bad the guy who sold me the truck had glued the wire down to make it look like it was attached...so there is one problem and I broke down and ordered two new injectors. I’m thinking they could be the issue. Was messing with the wires closest to the fire wall and the last two injectors seemed to be having a bad connection...They are the only two injectors that have not been replaced. So gonna cross my fingers this is it!
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Old 04-11-2021, 02:35 AM   #10
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after some back and forth i found that one of the cylinders was not firing and the mixture was suuuper rich. so i looked into the injectors a bit more and it turns out that both the gaskets on all of the injectors were toast after tightening them down which led to both a vacuum leak and gas just dumping into the cylinders... i made the mistake of not lubing up the gaskets before tightening the caps on. lesson learned. always grease up your gaskets! thankfully i had the old gaskets from the preveous injectors. just swapped them all out and lubed them up and NO MORE VACUUM LEAK OR RICH MIXTURE!
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