Thank you for your advice I clamped fuel supply hose as you suggested psi dropped for sure, looks like injector leaks. I also checked all the fuel lines and regulator did not find fuel leaks, I also pulled oxygen censor it black, I started up engine idles better looks like cat is plugged. I also pulled throttle body I noticed it has black deposit so is intake manifold. I need to send my injectors out for rebuild? I will purchase new one also I will replace my cat, I already boiled out my throttle body new gasket kit used and I will start on the rest.
Like I mentioned at the beginning I am a new here I thank you all for your support.

 

Based upon your original description and the tests you have run per prevoius CF member suggestions, my guess is that you have an injector(s) stuck open or a bad driver in the ECM injector circuit. The fuel pump and regulator are having a problem maintaining the fuel pressure due to the open injector(s). The 88 is batch fired, so if you have an injector stuck open, when the other side batch fires, it further decreases fuel pressure to a point that the pump may not be able to make up for the volumne loss fast enough to satisfy the needs of the system. This shows itself when you try to accelerate and the system needs additional fuel. The popping is from too much fuel in one location firing when it hits the exhaust, which in turn results in too little fuel in other areas, (no power).

The fact that you had 3 very different sensor fault codes all show up at one time is a bit disconcerting. That would make me look very closely at the ECM, the ECM wiring harness, and the wiring to the injectors. If the ECM injector driver circuit is failing or shorting in the wiring, that could be holding one bank open way too long when it should just be cycling the injector bank. The result would be flooding one cylinder bank and creating a lean condition in the other bank. It wouldn't run right, would smell of gas, and cause fuel pressure to bounce all over. The 88 only has one O2 sensor which is mounted on the driver's side exhaust. The O2 sensor would see lean if the passenger side injector(s) were sticking open and the driver side was starved of fuel due to low volume/pressure.

The extra fuel smell is probably from the stuck/open injectors and extra unburned fuel is being dumped into the cat. This can cause the cat to overheat and fail prematurely as well as possibly burn up your car.

I would obtain a good fire extinguisher (or two) before I continued troubleshooting with the engine running for any long period of time. I certainly wouldn't drive it anywhere far. Get the FSM as CFI-EFI has recommended and use the charts and detailed tests to eliminate the possible causes until you know the answer.

 

Ohm your injectors ( should be around 16 ohms).Check wiring harness to injectors for possible short to ground and, if you could, swap out the ECM for a known good one to see if that was your problem. If not get new injectors or or a good set of reman units. Also wouldn't hurt to invest in AFPR. #24 injectors seem to be common choice among forum members.

 

Thank you for your suggestions, Injectors checked out at 16.5,16.5, 16.4, 16.5, 16.4, 16.5, 16.5, and 16.5. I will purchase new injectors for sure. I started tear down injectors are out I already serviced throttle body, I ordered new injectors. I am replacing my cat now; the rest of exhaust looks good.

 

Thank you for your suggestions, I already purchase new injectors. I started tear down injectors are out I already serviced throttle body,. I am replacing my cat now; the rest of exhaust looks good. Soon as assembled I will troubleshoot.

 

dude always start with highest dtc 1st. your case code 44 lean exhaust. the 02 is reading a voltage signal less then .2 volts for 50 seconds with system in closed loop

 

dude get a helms shop manual follow flow chart and diagnostic aids for code 44. your o2 is signaling the computer with a voltage reading of .2 volts for 50 secs. to do the the test the computer should be in closed loop to begin with. a few short cuts-with the mass air fow sensor unpluggeed start the motor. if lean condition is gone replace mass air flow sensor. also ck ckt 412 on computer for short to ground or faulty ecm. make sure you have no exhaust leaks in the exhaust around the o2 area-o2 wire isnt grounded-u have correct fuel pressure-no lean injectors-dirty fuel or your air system pumping air into the exhaust when in closed loop tired of typing get a helms and follow the flow chart good luck crash:

 

If you haven't yet solved the problem, consider what Richard said about the AIR system. I believe I have a AIR management valve that's misbehaving (I haven't fixed it yet) and got codes 13 and 44 today. If extra air is getting pumped into the exhaust manifold, it could cause lean exahust and the O2 sensor to be a bit confused.

Let us know how it turned out.

 

Hello everybody,
I finally restored my 1988 Corvette.
Code was set 13-22-44
First I replaced my fuel pump and filter psi was restored, my cat was plugged, the main problem was ECM also MAF sensor. I decided to give my ride a 19-year tune-up.
The following parts replaced:
Fuel pump-fuel filters.
Catalectic converter.
TPS
Oxi sensor
ECM
MAF sensor
Replaced fuel regulator, also replaced fuel rail o-rings.
Installed new injectors.
EGR valve.
Cleaned throttle body.
Spark plugs & wires.
Dist cap etc.

At this time I like to thank you all for your support and help. I found an interesting site to solve corvette problems at http://chevythunder.com/index.htm