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Discussion Starter #1
I just bought a 91 4cyl Hardbody 4wd with 113k miles and drove it home. (about an hour and a half drive). The next day I took it out for drive and it ran fine. I pulled out of a gas station and hit a little bump and it started to tick very badly and had almost no power. No check engine light. It will start and idle just fine but sounds almost like a diesel all the way through the rpm's. Changed spark plugs and distributor cap because they looked rough, no change. I then removed the valve cover to check the timing chains tension because I suspected it may have jumped time or something and it seems very tight? Ive never experienced anything like this and any help would be appreciated. Thank you
 

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Discussion Starter #5
Okay I just replaced the iat sensor and it didnt make any change? Very confusing as I cant find any information on a similar issue.
 

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Okay I just replaced the iat sensor and it didnt make any change? Very confusing as I cant find any information on a similar issue.
A code does not always mean the sensor isn't working. It means the ECU is not getting the signal that it expects. You could have bad connections going to the sensor or a bad ground wire for the sensor.
 

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Discussion Starter #7 (Edited)
Well the wires were broken off for the sensor and it wasnt plugged up to anything so it wasnt functioning so I'm not sure. I also just did a compression test just to see and all cylinders are between 70-80 it ran great before this and still doesnt smoke or anything.
 

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Well the wires were broken off for the sensor and it wasnt plugged up to anything so it wasnt functioning so I'm not sure. I also just did a compression test just to see and all cylinders are between 70-80 it ran great before this and still doesnt smoke or anything.
What, you think hitting a bump is going to knock out the compression in your engine? 70 to 80 seems low, but that is for a different discussion.

More likely hitting a bump made the corroded wires lose contact.
 

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Discussion Starter #9
No I'm fully aware that hitting a bump didnt make me loose compression.. It is a valid point to bring up considering that is only around half or so of what it should have. However the IAT didnt have anything to do with the issue as ive replaced it. It's throwing no codes now so I'm leaning towards it being a mechanical issue, it sounds mechanical for sure.
 

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Discussion Starter #11
Thank you for helping me narrow it down. I can't imagine what could cause this strange scenario and unfortunately I'm an amateur at diagnostics. Also when I took off the valve cover there was a broken cylindrical (about the size of a quarter in diameter and about an inch long) piece of plastic laying near the rocker arms. Doesnt seem to be a piece of tensioner or guide, considering they look to be intact.
 
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