crossfire restart problems - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old Jul 19th, 11, 09:50 PM Thread Starter
Sean
 
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?
swt1313 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old Jul 20th, 11, 04:38 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,708
Garage
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.

What did the forum members suggest at www.thirdgen.org?

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #3 of 3 (permalink) Old Jul 20th, 11, 07:17 PM Thread Starter
Sean
 
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
swt1313 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome