This is part 7of a multi part video series about how to troubleshoot any ignition, fuel injection or timing issue. I describe the sensors and how to troubles…
GM Troubleshooting Part 7 – Sensors and control valves (non EGR)
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pcv = positive crank ventilation
I have a 1998 GMC sonoma when it cranks it goes dead like you cut thje switch off. I by passed the switch with a push button and still won’t run.I put new fuel pump relay also. Any ideas
Its great that he tells us where and what each sensor is and located. This is a must watch over and over again for a great learning tool. I will replace the egr sensor since he has shown me where it is.
I am learning so much from guys like him.
sounds like it is running rich. I have seen this before with a Saturn that had a faulty temp sensor (was reading cold). does your temp gauge work? how many temp sensors on the rig (many engines have one for the gauge and one for the computer). This could be a wild goose chase but you never know.
My suburban is having trouble starting and it dies often while I driving. To start again I have to put gas to the floor while I turn the key. Also idles funny. Any idea
I have a 95 blazer and when I floor it it sputters and have bad acceleration but when I unplug the Throttle Position Sensor it runs and accelerates fine. Any ideas y?
PVC if no one has told you is “Positive Crankcase Ventilation”. Good for me, helped to figure out the true problem I’m having in my 4cyl 95 GMC Sonoma, I’ve got it narrowed down and if it’s the coolant sensor, that would be great, but I’ve a feeling it’s the TPS 🙁 Thanks for the help.
Way more professional than a lot of youtube videos about cars, nicely done.
With the idle air control valve u set the pintle to 1 1/8 inch and then install ..hm technician here good videos by the way
PCV, Positive Crankcase Ventilation, you deserve to know! BTW, I have to commend you on this series! There are other sensors I have not seen, The MAF And the Crank Position Sensor. The CPS will keep you from starting but the maf is notoriously known for running rich in GMs. I sure wished someone could tell me where that is on my Lumina car or my Astro for that matter! On my Astro, the cps is under my rotar, pretty easy with that. Don’t forget the guy who prototyped much of this o2, in exhaust.
the truck was not running when this video was taken. What you are hearing is a ticking noise that my $99 after tax digital camera injects whenever it records a video… it has done that since new… not sure why.
your truck has a ping sound in the background is that normal ?
I am not an expert on knock sensors but there are usually 2, one on each side of the engine (1 for each bank of cylinders). I have also read that they are very prone to failure if the engine is pressure washed…
hi .. i have a question i have a 2001 gmc yukon 2wd 4.8 i went to place to check my car and the computer show knock sensor defective ,,i want to know how many knock sensor my truck has ?
hi there… no spark or fuel pressure… hmmm…not a fuel pump issue… i am thinking the easiest thing is troubleshoot why the fuel pump is not working… that would be way easier than trouble shooting the ignition… check all your fuses for starters… then try to manually engage your fuel pump (should be a test plug under the hood to trigger the pump). get a manual and go from there on fuel pump tests.
hey bro i need some help i have a 1996 chevy s10 2.2 l and it wont start the weird thing is it gets no spark and no fuel pressure i have replaced the fuel pump and the cables for the plugs still no spark or fuel pressure im thinking it is the computer or some type of senser could you help me with this personal message if you could be a big help right now..
.ps. it was working fine until i ran out of gas and put more gas in it and haveing these problems please help me thanks
As we become more and more dependent on OBD codes to make a diagnosis, it makes it even more important to emphasize those situations where codes don’t show up. I’ve often wondered whether poor fuel efficiency is due to ‘silent’ sensor malfunction. This is a really good review, thanks for posting.
hi there – on my 94 4.3 it had 2 sensors. the one on the drivers side between the back 2 spark plugs was for the dash gauge. the one that was nearly impossible to see without a flashlight was behind my coolant thermostat. it took 3 tries for me to find it but… it was there. i would call GM if I were you. with your VIN they can tell you the # of sensors and probably location.
ok,i have 2001 chevy s10 v6 has 2 temperature sensors? I look at my motor and I’m looking at 1 and actually ask the auto parts store and only shows 1 you now ? some help please
hi there… i am having trouble understanding your description about horns and boards… the temp sensor is typically all the way cold upon startup with a cold engine and about 40-50% when fully warm. if you have temp readings higher or lower than that range when warm you might have a stuck open (runs cool) or stuck closed (runs hot) thermostat. Most engines have separate temp sensors for the dash gauge and for the computer…and they have no impact on each other.
Hi I have a question? I have a 2001 chevy s10 v6 temperature till my board marks almost 1 / 2 and the manual horn design that is almost 1 / 4 or is it normal that you recommend? change the 2 temperature sensors
Thank you so much. This car may be running richer than yours. I’ve never seen anything like it. Years ago my company had a ”old school” fork lift that ran that way. I replaced everything, but I never did get it to lean out. I’ll get up with you later. Frank.
Hi there,
thanks for the comments. you likely won’t get any codes unless you can actually run it at highway speeds. Until then, i would check engine temp sensor (NOT the guage temp sensor), O2 sensor, dirty stuck injector, fuel pressure and regulator, grounds to the computer. I think I have some other videos that cover all these checks if they aren’t covered in part 7. good luck and let us know how you make out.
I have a 1993 chevy 3.1 that is running supper rich. Just like your truck. And it is a convert., so I’m wanting to drive it now. I’m thinking it is the engine temp. sensor. By the way, thank you for this info. I have no codes which is strange. What do you think about that? Thank you. Frank.