crossfire restart problems - Team Camaro Tech
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post #1 of 3 (permalink) Old Jul 19th, 11, 09:50 PM Thread Starter
Join Date: Jul 2011
Location: pennsylvania
Posts: 2
crossfire restart problems

I have an '83 Z28 with a 305 and crossfire fuel injection. On a cold start, it starts perfectly, and if i get the engine hot, shut it off, and then restart it immediatly, it restarts perfectly. If the engine runs long enough to reach max operating temp(200-220 degrees F), and then is shut off long enough to cool to anywhere between 120 and 175 degrees, it does not want to restart. It starts for 2-3 seconds before starting to lope(almost like an engine with an oversized cam), sputtering and dieing out. The only way to get it torestart in this situation is to keep pumping the throttle wide open until the engine evens out and clears up. Propping the hood open after shutting the engine off solves the problem, and mixing race fuel with my 93 octane helps, but doesn't fix the problem. I obviosly have a fuel/heat problem, but the mechanics i've talked to are stumped as to the exact problem. I've replaced spark plugs, the fuel filter, checked the fuel pump(good), fuel pressure(11lbs), replaced the engine temp sensor, and checked to make sure my injectors weren't leaking gas into the intakes when the engine was cooling. My problem started the summer of '09, around the time ethanol was put in our gasoline. I'm wondering if it's related to the 10% ethanol in our gasoline. Can anybody help me with my problem?
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post #2 of 3 (permalink) Old Jul 20th, 11, 04:38 AM
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Location: Va Beach VA
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Re: crossfire restart problems

Welcome, Sean.
Good symptom description and troubleshooting history.
I'm sure you have tried different brands of fuel.

The one item you haven't checked is the sensor inputs to the ECM from the interior side - is there a good conductive path from the sensor connector to the ECM socket? More than likely , there is a good path. Never hurts to disconnect and clean with alcohol and a Q-tip.

My suggestions are;
Just before the cooled down restart, unplug the fuel relay and jumper across the socket to allow the f/pump to run for about 10 seconds or so before cranking. Leave the jumper in place after the engine starts and perform a few times just to compare results. If it improves, install the relay and a few times before cranking, turn ign sw to IGN to let the ECM power the f/pump for 2-3 seconds. There is a time limit between IGN, 5 seconds of rest before the next power cycle. It could even be the f/pump relay and/or its socket having corrosion on the relay contacts or socket contacts/terminals. Contacts develop a carbon covering across the point set due to arc flash and over time, carbon/resistance builds up. Heat adds to the resistive property and limits the amount of current through the point set. Same goes for the socket terminals.

Another suggestion is check the oil pressure switch under the dist. It is a parallel path of power for the f/pump. If ECM fails to power the relay, the pressure switch powers the pump.

Another fix is to add a marine starter button and hardwire power to the f/pump, remember the jumpering of relay socket? Make it a ritual to prime the fuel system before starting.

Another fix is not to drive the car in the summer time. Just as the doctor says, you tell him it hurts when you do this and he says don't it.

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post #3 of 3 (permalink) Old Jul 20th, 11, 07:17 PM Thread Starter
Join Date: Jul 2011
Location: pennsylvania
Posts: 2
Re: crossfire restart problems

Thank you Everette for your suggestions, I'll give them a shot. I am new to the car forums, and appreciate your reference to another forum. I will post my question on there to see if there are any similar experiences
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