95 corvette rough idle

95 corvette rough idle

EGR systems also helped eliminate spark knock from the increased combustion chamber temperatures. The feds were also pushing for a reduction of NOx nitrogen oxide emissions to reduce ground level ozone formation. The EGR system was an asset in many ways during the early years of emission control. As engine controls and development advanced, EGR has become obsolete for the majority of engine manufacturers.

95 corvette rough idle

Unfortunately, there are many Corvettes on the road with EGR systems failing. Metering the NOx inert gas was handled via a simple valve that opened when the engine was at operating temperature. EGR could not be introduced at idle, or rough idle and stalling would occur from leaning out the fuel mixture. EGR flow would only be introduced under light to moderate throttle openings, never under hard acceleration. Additionally, they used two different ways to determine if the exhaust gas flowed.

All C4s used electric solenoids, some NO normally open or NC normally closed until current was supplied. The Corvettes used ported vacuum supplying vacuum once the throttle was opened through a NO vacuum control valve solenoid. Certain criteria had to be met; engine at operating temperature, light to moderate throttle opening, and under steady state cruising.

Much like a fuel injector, the pintle moves up and down to control flow. To help control the flow rate more precisely EGR valves have internal vacuum check valves. The EGR pintle has two small orifices that allow exhaust gases to flow into the internal check valve. This allows the ECM to control the exhaust gas flow rate. The pintle seat is a calibrated orifice that allows the correct amount of exhaust gas to be metered into the engine.

95 corvette rough idle

Using any old valve could cause hesitation if the orifice is too large or spark knock if it were too small. Here the valve is placed in a vise and the upper part of the valve is twisted counter-clockwise. It is better yet to soak the entire end in the throttle body cleaner.

The seat is removed showing just how much carbon can build up on the valves. The flaky deposits can become lodged into the smaller intake manifold ports. This tiny orifice allows exhaust back pressure to react with intake manifold vacuum to control EGR flow. This small port can become plugged and the EGR will hang open.LouB answered 13 years ago. Hi Peach! I'm going to guess fairly confidently that the problem lies in one of three areas I don't know what your level of expertise is but chances are that a Chevy Service Manager will be able to pin down the problem fairly quickly.

There are other more subtle problems with vacuum, injectors, or electronics that might come into play too, but I'll bet the problems lies in one of those three areas I described. Have it check out by a pro. Good luck! I have what feels like hesitating and a vibration when I accelerate in my 87 corvette. I have replaced both tires, all the rear end joints including the drive shaft joints, also both rear hubs.

I do know I have slight oil leak and radiator leak as well. The sound just started yesterday. I have a different car.

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95 corvette rough idle

Search Chevrolet Corvette Questions. Chevrolet Corvette Experts.Gain extra benefits by becoming a Supporting Member Click here find out how! Send Private Topic View Profile. Execution time: 0. All times are GMT Pacific. Current time is AM Top. Attach Photos to Posts. Contact Us. My Cookies. Frequently Asked Questions. Forum Rules. Username Post: '92 C 5. Blew the old one up long ago. Truck has been running rich for a long time. Not smoking-black stumbling fouling-the-plugs rich; but you can definitely smell it at idle.

I've replaced the O2 sensor so long ago I've forgotten when. It's probably time to replace it again. I swear! Before I replace the O2 again, is it possible that there's not enough backpressure to warm up this non-heated style sensor? Is this an application where an O2 simulator might be a good thing, or are these really only for the several-sensor Vortec type apps where people have gone dual? Re: '92 C 5. It might be easier and cheaper to adjust the regulator to lean up the mixture a bit than it would be to buy a fake 02 sensor.

Just my 2 cents.Its a Vette. Just under 50k. It will run fine for weeks at a time, then it will idle roughly and between rpm will 'breakup' or miss.

1995 Chevy Corvette, LT1, Rough idle and breakup.

Then in a few days it will go back to normal. In or out of gear and both accelerating and decelerating. Checked for vacuum leaks. Plugs and wires seem fairly new. Possibly a failing optispark? Also it is independent of both ambient and engine temp. I'm stumped normally I don't have much trouble fixing these type og things but I can find anything wrong. Anyhow, thank you for your time. Check out the idle-air-control.

Should be mounted near your throttle body.

rough idle in the C5? what happened?

It could be gummed up due to the age of your car. I've had to replace the Optispark on my 96 Z28 more times than I care for. I too have tried to go cheap with the cheaper made optispark, never again. ChairForceOne not verified.

Porkwagon not verified. Propane enrichment with a hose put on the end of a torch will let you know if it's a lean misfire or not. If not a lean misfire or EGR stumble it would almost have to be in the ignition. There is a couple of guides out there on trouble shooting your Opti, I know one of them is on LTXtech.

If you are decent with a multimeter, you can detect what is wrong on your optispark, ignition control module, or coil.Automotive Forums. Pelase Help! My 95 camaro z28 has a rough idle and boggs out when excelerating! I recently purchased a camaro z with the lt1 motor. It passed a inspection and the Smog test before i picked it up. When i started it i noticed a rough idle.

It was at about rpm's in park, and about in drive. It has a real rough shaking to the idle like a miss or something. He immediatly said, durring the ispection the shop said it might need a fuel filter because it was stock. I drove it home and noticed it was hessitating or stummbling realy bad when i would give it gas, but when i was cruising on the freeway it ran fine??? Once i found the spot on the pedal where it wouldnt bogg out i could keep my foot steady and it would run smooth, but as soon as i stop at a light the idle gets rough and it boggs out when taking off from a stop, or giving it gas?

It runs at a super cool temperature, normally at about degrees but when i stop at a drive through and the car isnt moving it seem to heat up realy bad. I just changed the fuel filter which was not stock, and fixed a small vacume leak I found and it helped but it is till pretty bad!!

I pray its not a cracked head gasket, head or block! I have been hearing they probebly set the timing low to pass smog and that might be it? Please help. I just bought the dam thing this week! I just cant see how it could pass a inspection and smog and run like this??

Okay this really sounds like your Ignition Control Module or your throttle position sensor, but youd notice if it was the TPS if you hit the gas but it doesnt accelerate like it usually would.

95 corvette rough idle

But the rough idle sounds like the ICM.Even with eleven years already behind it, the C4 Corvette still managed to receive the accolades of enthusiasts and critics alike. It received praise for its jaw dropping acceleration and equally for its intense road grip and superior handling.

1995 Chevy Corvette, LT1, Rough idle and breakup.

Despite its long and successful run, the years of the C4 Corvettes were drawing to a close. Much of the Corvette design and engineering teams would now be actively engaged in testing the next generation sports car so, for its second-to-last model year, the C4 Corvette received only minor enhancements. Mechanically, the already robust LT1 engine received additional refinements. The connecting rods were revised to improve strength and weight uniformity, the engine fan was made quieter, and the fuel injection system was improved to utilize alcohol-blend fuels, which began to have an increased appearance at gas pumps around the world at about that same time.

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Additionally, the new fuel injectors were developed to reduce fuel dripping when the engine was turned off. Beyond the engine, additional mechanical improvements were also made to the drive train and other areas of the car. The electronically controlled four-speed automatic transmission was refined to provide smoother shifting, and the torque converter was made stronger and lighter. This system would reduce wheel slippage by controlling the brakes during driving conditions where control of the vehicle might be compromised.

All Corvettes also received a ride improvement with the introduction of the less-stiff DeCarbon gas-charged shocks. Beyond this single physical change, the only other cosmetic differences involved the introduction of a new paint color — Dark Purple Metallic, which replaced the depleted Copper and Black Rose metallic paints.

Inside the interior, the changes were equally few. Torn leather had become an increasingly common problem amongst consumers of the C4 Corvetteand so this response to address the tearing issue was well received. Aside from the stitching, all of the other modifications to the interior were invisible or carefully concealed away.

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The CD player was given a stronger mounting bracket to prevent skipping. Several adhesive-fabric straps were installed in key places around the cabin to help reduce rattles, a problem that is commonplace to most Corvette owners. One interesting change that was introduced in the model year was the introduction of an option that actually deleted equipment off of the car. Another special-edition Corvette was made available in After a near-stock LT1 Corvette Convertible paced the Indy in — which was only the third time Corvette had ever been bestowed with this honor — Chevrolet decided to commemorate the occasion by producing a specially optioned Pace Car Replica.

hesitating and stumbling with acceleration

In the running of the 24 Hours of LeMans, the Corvette racing teams would dominate the Porsche teams in both qualifying and finishing results. The car featured an all-white convertible top, specially embroidered headrests, and unique graphics and trim. The last C4 ZR-1 was driven off the assembly line on April 28,resulting in a total number of 6, units being built during its six year production run.

As for the base coupe and convertible, the total sales numbers decreased to 20, units for the model year — even after dealerships began discounting prices to try and entice more buyers to purchase a Corvette. However, it was reported that Lotus engineers had begun work in on an improved LT5 engine that would have produced between and horsepower.

Whatever the ultimate reason for discontinuing the ZR-1 — a report in AutoWeek summed the supercar up perfectly. With rocket-sled acceleration, mastiff grip, and right-now brakes, the ZR-1 has the largest performance envelope of any mass-produced American car ever built. It also has the amenities and acceleration of a modern passenger car and none of the temperament of a race car.

We may never see the likes of it again. For all Corvettes, the Vehicle Identification Number was stamped on a plate on the inner vertical surface of the left windshield pillar visible through the windshield. The Recall Began On October 18, Sit Bulletin Q : Hello, Vette. I am a guy that likes to work on my own car and I just wanted to say thanks for all of the DIY articles that you publish.

I have a C5 Corvette with very low miles. The car only has a slightly rough idle but performs well on acceleration. I have done a tune-up including spark plugs and ignition wires, which did not fix the problem. So, I performed a compression test and all of the cylinders have virtually the same, good compression. There are no vacuum leaks, and using a stethoscope I can hear the No.

I have a scanner and on the misfire screen I do have misfires on cylinder Nos.

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A: Frank, you have obviously done your homework. If I had to guess, it sounds like you are describing a clogged fuel injector. One of the most common symptoms of a clogged fuel injector is a rough engine idle, and yes, we are seeing more and more clogged fuel injector problems.

Diagnosing a clogged injector is not always easy because it acts similar to a bad ignition coil, a broken spark plug wire or a bad spark plug. However, a fuel injector that is starting to clog has a certain feel. You will have a slightly rough idle but the vehicle will seem to accelerate and perform normally until the injector becomes completely clogged and creates a cylinder misfire.

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Once an injector or the filter basket becomes clogged, usually it is too late for intake or fuel rail injector cleaner to resolve the problem. The most effective way to deal with a clogged fuel injector is to remove it from the engine and replace it or have it professionally cleaned. One of the obvious symptoms of a clogged fuel injector is when the Check Engine Light illuminates due to DTC code s associated with a clogged fuel injector, and can range from misfire codes to lean codes.

Fuel injectors simply block the flow of fuel. Only when the computer activates them by completing their electrical circuit do they open and let fuel spray out. If the injectors become restricted or blocked, the amount of fuel that can come out when the computer opens the injector is reduced.

Also, if the injector is clogged, the fuel will not atomize correctly and this can cause a rough idle or reduced power. We want you to have the ability to analyze any fuel injector problem so we are going to go over diagnosing a defective fuel injector as well as diagnosing a clogged fuel injector.

Injector problems fall into two groups: mechanical and electrical. On most Corvette models, ignition voltage is supplied directly to the fuel injectors. The engine controller controls each injector by grounding the control circuit using an internal switch called a driver.

The primary function of this driver is to supply ground to the component being controlled. While the engine is running use a stethoscope to listen to the injectors for a clicking. You should hear a clicking noise as the injector coil is energized. If no click is heard, turn off the engine and install a Noid light.

Start the engine; the Noid light should flash while the engine is running. If the Noid light is flashing while the engine is running, unplug the Noid light and reconnect the wiring pigtail back into the injector. Again, check the injector for a clicking using a stethoscope.

If a clicking is heard you still could have a clogged injector.