- Chevy coolant temperature sensor symptoms upgrade#
- Chevy coolant temperature sensor symptoms full#
- Chevy coolant temperature sensor symptoms code#
First check the number 3 and number 4 spark plug electrodes as those cylinders always run off a different injector. MUCH better pump than the EP386 TBI pump.
Chevy coolant temperature sensor symptoms full#
If the fuel pressure drops more than 1 psi under 8-10 seconds of full throttle the pump should be changed and dont put the stock TBI pump back in even if your engine is stock. Nice thing about the Actron gauge is the hose is long enough that you can watch it while you drive. If its running 9 or 10 you typically have a weak fuel pump.
Stock setups can range from 9-12psi and find they run best closer to that 12 number. I use a Actron CP7817 which you can typically find on ebay very reasonable and a good diagnostic tool to have. Always good to have a pressure gauge on hand. Not enough is typically weak fuel pump or low fuel pressure. Typically we either don’t get enough or we get too much. Fuel is the easiest to figure out so I am going to start with it. Worn out cam chain can also cause that timing to jump on very high mileage engines.Ģ. Jumpy ignition timing from a distributor problem can set off idle surge. I recommend checking that fuel pressure in the fuel section and the timing tests on the distributor in the ignition section. Now if your motor is stock and your having this issue its VERY rare problem. Above that very likely to have a problem. 050 you can run up to a 214/218 duration cam with a new chip without too much issue. Its processor is too slow and fuel table too small to handle a big low vacuum camshaft. If you chose a cam that doesn’t make enough vacuum for TBI then your going to have some level of idle issue regardless of chip with TBI. Need to run a chip designed for your camshaft.
Chevy coolant temperature sensor symptoms upgrade#
Running with stock programming with a low idle speed setting combined with the fact the chip is designed for 20-21″ of vacuum at that idle rpm with a cam upgrade which typically drops the vacuum to 18″ or less will cause the motor to run too rich which will spawn a high idle speed where the motor will then lean out and rpm drops and repeat. Cam change is one of THE most common causes of idle surge. Need to see what has changed since it idled correctly. This is either a too lean, too rich or jumpy timing. No one likes it and can be bad enough to cause the motor to stall at not so great times.
Chevy coolant temperature sensor symptoms code#
Finally a faulty chip which should set a check engine light code 51 will cause a high idle because limp mode sets a high idle and a set ignition advance to allow you to limp home on the very basic of programming. so if you plugs are black don’t expect a good idle need to figure that out under fuel issue. Also a really rich fuel mixture will often cause a high idle. NO CARB CLEANER and some penetrating oil and work it in and out a bit and see if that helps. you can remove it can clean with WATER ONLY. Thing isn’t real cheap so we save changing it until last. Next, you can have a bad IAC (idle air control) valve on the side of the throttle body. Next cause for high idle is a bad coolant temp sensor in the intake by the thermostat housing as idle speed is temp based. Finding the leak can be tricky as it can be the intake gasket on the bottom side if you are using a Chinese junk carb intake or you weren’t real careful putting the intake on. TBI being a MAP sensor based system will see the leak just like opening the throttle blades and will feed the leak and then you have a high idle. this is most often caused by a vacuum leak. Idle surge or idle hunting and high idle. Idle issues has to be one of the most common issues that I get contacted about. Pretty much all issues are going to fall into 4 catagories.ġ.
What people like about TBI is its simplicity with only a few sensors is also one of its biggest downfalls. Works with any fuel injection really since most shops really can’t properly diagnose unless computer just tells them what is wrong and unfortunately with TBI that usually doesn’t happen. I have decided to create a page on trouble shooting TBI.
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