The knock sensor has a larger electrical connector. If not I would hire someone for the first time and learn the tricks. The local shop said they replaced it, but it doesn't look new. As you add the load you will need more fuel to achieve the same rpm. It also increases the amount of hydrocarbon and carbon monoxide emissions from your vehicle to the surrounding atmosphere. . The voltage should be about 4.
For the 87 models… It is located in the same place as a 350ci Chevrolet engine. Its a little gray box with a plug and, hopefully, two wires attached to the bottom. It has a little wire latch on top and a small metal clip near the bottom that holds it in place. So, I took it to my mechanic. Not an auto repair expert? But I'm not sure what else to look at based on map. There is a single wire oxygen sensor in the drivers side exhaust manifold. Going to check the vacuum line from the map tonight.
Low pressure would mean it's the pump or the fuel pressure regulator on the throttle body. Pull the oil filter off. There should not be a steady 12 volts to the injector--if good injector, it would be spraying fuel steadily into the throttle body. I had the same problem a while back. What my truck does is it will be idling just fine when the idle will fluctuate for a minute or so then go right back to idling fine. I think I am getting closer to the solution.
Then stopping at a light I cut the radio and it was doing it again only slightly. Drive it for a bit and see if it will reconfigure it's self! The platinums caused me more problems. If you have a 'V' configuration engine there will be 2 O2 sensors. Make sure that the sensor wires are free of any contaminants. Please rate the quality of this answer. It is easy if you have the right tools, but I wouldn't try it without them.
BoxMasters I know it has been a while since you worked on the suburban but I seen you have had other projects with the same vehicle, Was it the map sensor that caused this issue, I'm having the same thing going on with mine and would like to know how yours turned out,, Thanks for any reply Hello joeroofer65, I am sorry to hear that you are experiencing vehicle concerns. They might look like they are spraying ok but 1 is just a little weaker then the other. Check the exhaust manifold then notice where all of the pipes come together into the head-pipe. So, I took it to my mechanic. A properly trained technician like those at YourMechanic are capable of diagnosing and repairing a. You said like it should? This has been an on going issue for a year or so and literally this morning found something that actually effects it! We are always glad to assist! Sent From My Moto X Using Tapatalk Update: feeling really incredibly stupid beyond belief over a year of time and effort many parts and dollars spent.
What effects will be noticed. There are only two temp sensors as far as the computer is concerned on any Ford gasoline engine. This way we know your answer helped. When testing the sensor, use a high input impedance digital volt-ohmmeter. Un like since new, it had to make several turns before starting , then the hessitation started, then the missing started.
Have you checked the fuel injector itself for an open winding or stuck valve plunger? Hi all, I have a 1993 c1500 5. Try blowing through it in reverse with compressed air. His codes may hold a clue. Your idling also may be extremely rough. Please let me know if it passes the tests or if you have any questions, and thanks for using FixYa. Have both the map and maf sensor checked for proper voltage, one or both could be bad. It helps everyone to understand the final solution.
Usually if you go to a dealership they can run a diagnostics on it for about 70 bucks that they will deduct from the bill if you have them replace the parts that are bad. When the engine is running, the downward motion of the pistons create a vacuum inside the intake manifold For the purposes of engine control, when a technician says vacuum, what they are really saying is pressure that is less than atmospheric pressure. Please let me know if you have solved your problem yet. Also wiggle the connectors to ensure a that they are firmly engaged. The 454 used to fire up and idle high till warm, it always did since new, but last month after a trip it started missing. Boxmasters, You have been experiencing almost the same symptoms I am dealing with on my 95 Suburban 5.
Anyway I'm really not sure the map itself is out. There is a small clip to pull harness out, remove that, then the 10mm bolt that holds that in. It's been idling rough, bucking and occasionally stalling at stops. What happens is The connecting bearing spun in the engine, until it was small metal chips, then the engine makes a knocking sou … nd and does not run smooth at all. Usually if the ignition fails on this truck it wont even start so I'd start with the fuel system. I have checked for vacuum leaks and tested or changed several items and it still comes back.