1990 Chevy Camaro car starts then stalls

Hi leomnr2008,

Thank you for the donation.

CODE 53: SYSTEM OVERVOLTAGE

This code indicates a basic charging system problem. Code 53 will set if voltage on ECM battery voltage line increases to greater than 17.1 volts for 2 seconds or more. Check and repair charging system as necessary. During the time this fault is present, ECM outputs will cease. Additional codes may also set in memory.

© 2008 Mitchell Repair Information Co., LLC.

Get the charging system tested first. When the charging system is at fault, it can cause the symptoms described.

fixed the problem with the ecm it was an unpluged passkeyII component, but car still wont start pulled codes and it said wrong prom/eeprom switched chips with old computer and fixed that code no new code but car wont start

please help need car because trans blew up on other car

What is missing causing the non starting, ignition or fuel?

At bottom of the post you would find a link " First Things To Check ".

It has comprehensive details on how to go about testing/checking what is missing.

Let me know what you find.

Hope the new ECM is not the cause of the problem.

went through the pin out using a wireing diag and a dvom and found two open loop circuts pin A11 and pin D2, A11 goes to the tp sensor and splices to the MAT?? sensor(what is this) and the coolant temp sensor, and pin D2 goes straight to the map. can i splice into these wires and add new good grounds or do i need to pull the wires and run them to find the open.

Also it has fuel, and spark and i reset the static timing to make sure that it was good followed the base timing instructions.

The sensors concerned would cause non start conditions.

MAT = Manifold Air Temperature sensor.

You can splice the wires and make them work as a temporary measure but wires do not break for no apparent reasons and it would be advisable to check the wires for proper connections at couplers and rodent or corrosion damages.

ok i fixed the problems with the ecm and the throtal body car will now start but as soon as i let go of the key for the run position it floods its getting to much gas now am going to replace the new spring in the regulator with the old one and see if that makes a diffrence otherwise i feel that the fuel pump is putting off to high of pressure any other ideas

the ecm was fine and the new one is good so now i have two for this car

The fuel pump would produce a high pressure and it is the fuel pressure regulator that controls and regulate the appropriate pressure.

Check for clogging of the return hose to the fuel tank. Kinked fuel lines would prevent excessive fuel from returning and builds up the pressure apart from a faulty pressure regulator.

You mentioned replacing the throttle body, check if the throttle position sensor is set correctly. Wrong adjustments can cause flooding as the ECM would induce the injectors to open more.

the fuel pressure was at 25psi the new spring was 1/2 the size of the orginal and when i put the old one in the fuel pressure came back down to 12psi it should be between 9 - 13 psi followed the pin point testing procuders for the starting system and found a faulty control mod and a faulty pick-up coil will be replacing them tomarrow and will let you know.

Wow, seems to be problem after problem cropping up.

Anyway it is good that you are making great progress and should be having the vehicle up and running soon.

Yes, I would love to know how you progress and would appreciate the input.

well replaced the controle mod and the pickup coil and it still wont start the fuel injectors work and i am getting spark and the scan tool shows all the pids in normal ranges for what they need to be i was told by the preson that owned the car that the guy prior to him placed a kill switch in the car but i cant find it and i also noticed that the fuel injectors stay on weather i am at closed throtle or W.O.T. shouldnt they shut off at wot and does thios present a ecm problem.

The fuel injectors would only work when the engine is being cranked. If the injectors does not stop working, they would flood the engine causing non starting.

If unplugging the injrctor wire harness does not stop the injectors from supplying fuelto the cylinders, check if they are stuck in open position.

If the injector circuits are being grounded at all times, it is a fault with the ECM.

well did everything my schooling has taught me and still no start damm this thing is frustrating, so now since my compression is good i am going to verify that the timing chain is not loose and sliping and if it is the retime the top and bottom of the engin and put in new timining chain and gears if needed.

If everything seems to be inconclusive as to why it is not starting, then we should go back to the basics.

Start from the beginning all over again.

Ignition timing.
Sparks
Firing order.
Fuel.
etc.