20 Most Recent 1990 GMC Sierra - Page 5 Questions & Answers

are you sure is the transmission which is giving you the noise or the differential ? check it out first .

To review, you have two temp sensors, one for the gauge on the dash and one for the computer. If you unplug the sensor for the computer the reading will be minus 30 degrees or over 300 which will make it very hard to start. Unplugging the sensor for the gauge would have no effect on the computer.According to the wiring diagram, the wire for the temp gauge is green, and the wires for the temp sensor for the computer are yellow and black.

coiuld need fuel filter replaced or maybe weak fuel pump. Can have it pressure tested to see if this might be the problem. Could also be dirty gas which some gas treatment might fix. These are the things i would check first being that you said all the sensors checked out...hope this helps and good luck..

Stater more?? What does that mean?

with the assumption its an automatic the following applies(if a manual youll need to remove the slave cylinder from the transmission, its located above the starter) 1.Disconnect the battery and place truck on jackstands if needed for clearance and remove the starter 2. Remove front and rear drivelines as well as speedo sender and and shift linkage (remove shift lever if manual and transfer case shift linkage if not push button, you should be able to just seperate the linkage from the ****** and transfer case and leave the linkage dangling) and any other electrical connections to ****** and transfer case (such as push button transfer case, and electronic automatic trannies) make sure to scribe a line or mark the drivelines in relationship to the yokes so they get installed in the same position for balance 3. Remove transfer case, this will take some of the weight off and make moving the ****** around much easier on you 4. Beggining with the top bellhousing bolt remove all but the bottom two bellhousing bolts (save those for later, one on each side) 5. youre going to need a helper for the next part unless you have a transmission cradle for your floor jack support the transmission with a floor jack remove the crossmember bolts from the frame or completely remove the crossmember from the equation,, either way works 6. remove the two bottom bellhousing bolts from earlier, the transmission is now free, you will have to wiggle it around some and **** it as sometimes the splines on the torque converter bind up, sometimes in low clearance applications you need to support the motor with hoist, remove the motor mounts and drop the motor slightly to get a better angle. sometimes the ****** will pop right off and sometimes you have to fight it a bit but thats the way it goes, just remember the ****** is heavy so be carefull if not useing a ****** cradle! hope this helps out, good luck. also i recomend buy a chilton service manual for any do it yourselfers, its only about 15 bucks and covers alot of stuff, such as removing the ******.

Hello! The Mad Street #8362 is not for a seven pin, computer controlled engine...It is for a five pin distributor...I believe your engine has a seven pin connector...The correct distributor is a: MSD Ignition 8555Guru...saailer I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Sounds like an ignition module to me. (located inside distributor)

Unfortunately, it sounds like you have a cracked block. To verify this, you can buy a test kit at most autoparts stores.

Freon has been banned, so unless you stockpiled a bunch of it you'll need to have the A/C converted to use freon free refridgerant. You may be able to get instructions here:

register for free at www.autozone.com Once registered you'll have access to repair and shop manuals for virtually any car or truck. All the data and diagrams you need now or may need in the future will be a couple of mouse clicks away.

If all was done correctly and your sierra is running fine it has to be your HVAC system blend doors not opening correctly...It is common for a lot of vehicles but mostly Dodge has this problem...These doors are inside the unit and they will break and not allow anything through or else stick open and allow everything through and not allow a change in air /heat blend...The quickest cheapest way to find out is to take it to a chevy dealer and describe your problem and only ask for a diagnosis...They will tell you if the actuator isnt opening the blend door or if the door is broken...It can only be done with a Tech II GM scanner..but ot is worth the money ...They make a quick fix which requires cutting the body of the unit and replacing the door or else replacing the faulty actuator..........This is true I hope this helps ...........Metalpoet

Try another coil and mount it correctly. Check wires for power.