My 88 Runs OBD1…assume the 91 does too. Short the pins on the OBD1 connector and read the “Service Engine Soon” flashes (you can Google how to read the codes). That will give you an idea of where to look. I had all sorts of readings - ended up replacing plugs wires, distributor cap and rotor, coil, EGR valve,relays, etc. Finally, I got an OBD1 flashing sequence that pointed to the computer. The computer in mine (88..2.5L) is an aluminum box located under the dash, behind the glove compartment. It’s kind of a pain to get out, but you can…one screw hold it’s blacked underneath the dash. I found a replacement computer in a junkyard (you have to have the same serial number box). There is a strip cover held on with two screws. Remove that and you can get to the EPROM inside. Transfer the EPROM from your truck to the replacement computer. Then connect and reinstall the computer. Once I did that, my truck Rand trouble free…and still does. Good luck!!
Thank you for the video.. I three weeks ago I picked up my 89 S10 2.5l Iron Duke and I am running into some of the same issues. Me and my friend just replaced the timing gear and crank gear. We have not yet timed it... I still need to buy new distributor cap and rotor coil wire's and spark plugs. All this because my truck died on me a week ago. My motor was running a little high and it had my friend said he heard a little ticking sound. After we ran some test we found out the cam gear was not on right and loose.
rough idle might be the MAP senson -its the black item attahed to the front of air cleaner housing Also the Idle air control valve it is under the air cleaner it attaches with 2 screws i saw a video where you can clean the Idle Air Control Valve i guess you can clean it with brake cleaner (dont fill up the part cause it is electrical the point of the valve should be clean and clean the inside of housing being very careful be real careful when installing the IAC the screws are small place something under the area to catch the screws incase you drop them a white rag or whatever check other videos gather info hope you can sort out the problem but it does sound like the MAP sensor uh i just noticed this video was 13 years ago well im late
You got to take the air filter off and look in the carburetor and you'll see a like a little deal that has like a flange on there and you got to clean that up or replace it and that's what was wrong with mine
Use mass air flow sensor cleaner for the maf sensor and carburetor cleaner for the carburetor. Helped my 93 s10. Oh and replace you your Idle air control valve if that doesn't work. More pricey though.
I have a 1989 GMC sierra s15 2.5L. My mecanic told me he had to drain the gas tank because the gas filter was very dirty. When my engine had a fault in my situation he told me it was the starter ground was NOT tight.
I'm having the same problem with mine RPMs go up and down the motor going all over the place it turned out to be that green plug in front of your carburetor it's disconnected and you'll notice the difference if it stops that means it's that part start buying things like crazy disconnect sensor at a time and see if your truck makes a change
Hi, thanks for viewing my video and posting a reply. I'd be glad to help, if I can, but your question is kind of hard to follow. Can you restate the problems you are having and any remedies you have tried? Thanks again. ps, I have uploaded more videos about my trucks problems and the fix that finally worked, new computer.
whspioneer89 hi,I've got a 87 s10 2.5.when I crank it up it idles fine but after 1 or 2 minutes the check engine light comes on and idles like it's cammed kinda but when I tap on the gas it goes off after a couple seconds but engine light comes back on.any ideas on what's wrong???
If you start it up right away after shutting it off it starts ok, but not as easily if it sits. Try letting it sit and before starting it dump a little gas down the throttle body, maybe a tablespoon or two. If it starts and runs right away probably a fuel delivery issue. Could be low pressure from pump, dirty filter or maybe injectors.
I got an 87 Chevy s10. Just replaced the gasket between the throttle body and manifold. This appeared to help a little.If I let the truck sit for 10 minutes it takes awhile to start. The fuel pump has been replaced. Is this a Vacuum leak or what is your thoughts.
Eres un gran amigo tengo una camioneta como la de usted y tengo muchos problema s con las mangueras de vacío se repara en general y ya no se sabe cómo van conectadas si hicieras otro video como el que está en redes pero más lento y como esta en el cuerpo de acelerador es im por tante pa ra mi y otros q
great truck but i have a EGR System failure & i just dont know what is wrong i went out and bought a new EGR valve but that did nothing took vaccum solenoid from another s10 did nothing it only seems to run good while the Intake valve i think it is, is blocked off but i dont really want to run it like that because the engine heats up fairly quickly i also changed to 02 sensor plugs & wires, distributor cap and rotar fuel pump and i believe i changed the fuel filter too and still runs rough
hi thanks men i got a same truck but a have a problem when the truck start is to accelerate so meaty is a carburetor or vacuum line problem so if you know something about it please let me know thank you
Could you make a video where you follow all the vacuum lines that are directly connected to the carburator. I think mine are all switches around also the wire where the O2 sensor connects since my truck has it cut
Alonso Garcia sorry I no longer own the truck. But it was running great after replacing the computer under the glove box. Also replacing the oil pressure sender fixed the oil pressure gauge fluctuations
My truck was doing the same thing compared to yours I don't know what yours was doing but mine was merging up and down RPMs I disconnected that green and front of the carburetor plug and it stopped rubbing up and down so I assume it's that part how much did it cost
Does the engine turn over with normal compression? I think the distributor is driven by the camshaft. Could be timing chain, broken camshaft or broken distributor shaft or gears.
Hey can you let me see what your throttle body looks like without the air filter on it I think Mom was changed out I just need to see what a factory one looks like
I have a question about hooking up ground to carb block is already grounded but can only , start it by grounding blue wire to carb in order to work fuel pump?
First off see if your coolant is getting warm as in the thermostat is closing and opening normally getting the coolant up to operating temp. If you have a water temp gauge in your dash that should tell you if the thermostat works. Then see if the valve is opening for the heater. It should be in one of the hoses that goes from the engine/water pump to the firewall.
Start with the easiest things first. Check your air cleaner. Then check to see that all your vacuum lines are connected and not leaking. You can try spraying some carb cleaner around the vacuum lines. If they are leaking the engine should rev up after it sucks the carb cleaner in. Check to see if you are getting enough fuel pressure to the throttle body. I think the psi is 10-15. Look for the correct psi in a manual or online. Check to see if the egr valve is sticking open or moving while the engine idles or revs up.
Do you know I think It is I am having similar problems with my tuck different year and engine. But something I have gone though just about everything and I do not have any lights on. No check engine lights means there is something ells going on. I think there is a computer module that is made to brake down but I can not finger out which one this is.
I own a 1991 s10 4x4 single cab that's shifting roughly. The clutch is very stiff, wiring of my bcc radio wires straight to fuse box hanging? Can't find fuse for radio?
Yeah the specs say there both 190 HP. But cant find out if there the same . block. A guy has one i was going to get in case mine went out. I have a truck the oil preasure reads 40 pounds. Was thinking i may rebuild the motor block out of the Blazer and put my heads and other stuff on it.
I've got an 88 s10 that seems to get hot when I drive it around and it sometimes gets so hot it blows water out from around the radiator cap. Why does it do this?
whspioneer89 well I know it ain't the head gasket anymore because I replaced it Tuesday evening and haven't got it back out to see how it does yet but it's got a brand new head gasket and no thermostat
whspioneer89 I don't know I had to tighten all the rocker arms back down today so I had a little time to go over and check a few things while they we're fresh on my mind and found the distributor cap was turned a little somehow but somebody had put it in the wrong spot would that have anything to do with my truck starting and running rough
I no longer have the truck but I believe it did have one. There should be a rubber hose the size of a finger going from the air cleaner to the valve cover. The PCV valve should be at the end of the hose by the valve cover.
what is the name of the silver hose coming from under the air filter to engine called, i need to replace mine and have no idea what to ask for. thank you
@@whspioneer89 Do u know on s10 91 4x4 by the air filter if straight looking facing truck on the left is this missing a tube that may be causing vacume leak ??
Thanks for viewing and watching. The computer was the problem and the truck ran great for years after it was replaced. These little trucks were great for mpg
