Just bought my first mighty max!

[Ricekidd]

Hi Everyone!

Just bought my first mighty max and having some acceleration issues. Check engine is on but not sure if the truck has OBD sensor plug?

Thanks Guys!

[pennyman1]

Welcome to the forum. Your truck does not have an OBD II port - the check engine light is activated off the odometer. Check all your vacuum hoses, especially the ones going to the box on the drivers side inner fender.

[Ricekidd]

Thanks!

When you say check the box, do you mean the cylindrical canister? I checked that an it has 2 hoses going into it. One to tank and the other one im not sure what it says, but there is a middle one that says to carb. There is nothing connected to that and also mine is fuel injected. I was thinking that it might have to do with the igniter or spark plugs and cap/rotor. I also bought a new fuel filter, hopefully its nothing serious. I still have yet to do a compression test. Can anyone point me to where I can get the factory service manual?

Thanks guys!

[Ricekidd]

Also, you said the check engine light is activated by the mileage of the odometer. Do you mean the maintenance required light? How do I check what code the check engine light is for?

[pennyman1]

if your truck is fuel injected, either it is not an 1988 or had a motor swap. There is a connector under the dash that you hook an analog meter to for codes, but I am not sure where it is on the 2nd gen trucks - I am a 1st gen guy mostly. Search the forum for reading codes - there are several threads on here for that.

[royster]

There is a connector under the dash

The connector on 2nd generation is by the fuse box (driver's side).

[Ricekidd]

if your truck is fuel injected, either it is not an 1988 or had a motor swap. There is a connector under the dash that you hook an analog meter to for codes, but I am not sure where it is on the 2nd gen trucks - I am a 1st gen guy mostly. Search the forum for reading codes - there are several threads on here for that.

Sorryn Pennyman1, i have to change my vehicle on my profile. should be changed to 1990

[Ricekidd]

The connector on 2nd generation is by the fuse box (driver's side).

Thanks royster!

[Ricekidd]

*update

I fixed the issues. It was the fuel pump, looked it was the original one that came with the car. Replaced it and fixed the hesitation.

Also, I am getting a CEL for code 21. Checked the book and correct me if I am wrong, says its the water temperature sensor? I looked up a replacement but Im getting a single wire water temp sensor. My engine is FI, can some one point me to the right direction?

Thanks!