|07-09-2012 08:21 PM|
|Ripper 410||Stop!!!!!!!!!!!!!!!!!!!!!!!!!! You say it has sat up for awhile and now it runs if you pedal it the iac is stuck (idle air contol) the little 4 prong plug nut looking thing on the back of the throttle body passenger side rear cost about 50bucks local parts house clean the throttle body with carb cleaner before you change it|
|05-28-2009 02:09 PM|
check or replace cap and rotor if they are old at all. 4.3L are bad about eating caps and rotors and it causes all kinds of issues.
check the pink and white wires from the coil to the distrib they like to break inside the insulation where you cant tell and it will cause no fuel injection and no spark both i have found out in the past. mess around with them while cranking or running and see if it changes anything.
took me a year to figure this one out the first time on a 92 4.3L we had that randomly wouldnt start or would randomly die, we replaced everything only to find out it was the pink wire of this short harness the whole time!
make sure the distributor is set to zero also
bad ground is not a common issue on these, but its worth checking them sure.
fuel pump death syndrome is extremly common on these along with the bad cap and rotor syndrome
these two and the coil primary wires is where i would be looking
|05-27-2009 07:35 PM|
I knew that jk
|05-27-2009 04:53 PM|
|va4cqd||pooched means bad|
|05-27-2009 03:59 PM|
what you mean by pooched??? Im still thinking its my presure,I havent ckecked it yet. And how can i ckeck my presure,I dont see no fittings on the fuel lines. Can i take the line off the TB and hook a gauge up to it and spin it over and ckeck it there???
(I've had pooched TPS sensors display this type of symptom.)
|05-27-2009 08:46 AM|
|05-26-2009 08:39 PM|
You might give the TB a good cleaning w/spray carb cleaner. I've had them run pretty ratty until cleaned up. Maybe not as bad as you're describing.
|05-26-2009 07:34 PM|
i have checked all the grounds straps,and retighten them,and even ran another ground just to make sure,if the ground was bad,it wouldnt run right??
and yes,me pumping the gas kept it running..The ground i checked was on the passenger side firewall going from the frame to the firewall to the engine,and the other was near the battery,and another one was on the intake.
|05-26-2009 07:06 PM|
|05-26-2009 06:51 PM|
|va4cqd||fuel pressure when running should be 9 to 13 psi|
|05-26-2009 06:49 PM|
|Robbie||I got it to run ,but i have to keep pumping the gas to keep it running,but as soon as i take my foot off the pedel,it stops.Im thinking maybe its my fuel pump,even tho its pumping gas,it might not have enough presure to keep it running. Does anyone know what the fuel presure should be?? and am i guessing right??|
|05-26-2009 05:30 PM|
|T-bucket23||There is a ground wire on the firewall for the injectors. It is known to corrode or break.|
|05-26-2009 03:07 PM|
Help with throttle body on 1992 1500 silverado??
my son has a 1992 silverado 1500, with a 4.3 engine, The truck has been sitting for about 3 months but has been cranked just about everyday ,the other day we added gas and about two days later it started running rough,and now it want run. I changed the fuel filter thinking maybe the old one might be cloged up.But that didnt fix it. Then i took the fuel line back off of the back of the fuel filter and turned the key on ,and it has good gas presure coming out there,and then i did the same thing at the throttle body and it has good presure there.But there is no gas coming out the fuel injectors,I checked all the fueses,and the wires on the injectors and they have power going to them.I can spray starting fluid,or a mist of gas in the throttle body and it cranks right up and runs as long as i keep spraying it..
I was going to take the fuel presure regulator out of the T/B and see if i could see anything,but sence i havent never worked on one before i thought i better ask first, any help would be great..