Dumping fuel
Thread Starter
3rd Gear
Joined: Dec 2019
Posts: 3
Likes: 0
Dumping fuel
My 1984 is dumping way to much fuel it is spraying but a lot won’t run unless you are driving I have replaced the ECM and the temp control sensor and the map sensor it did it once before but when I drove it it stopped and ran great for a couple months and then it started again and it still is I need help the only code it shows is bad map sensor but I have tried three different ones
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
My 1984 is dumping way to much fuel it is spraying but a lot won’t run unless you are driving I have replaced the ECM and the temp control sensor and the map sensor it did it once before but when I drove it it stopped and ran great for a couple months and then it started again and it still is I need help the only code it shows is bad map sensor but I have tried three different ones
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
I know the X-Fire is sensitive to fuel pressure, but I would also be looking to see if one of the injectors is just dumping fuel (stuck open). No direct experience with the X-Fire, but I always support checking things before swapping parts. Pull plugs as well and see if one bank runs richer than the other. No promises this is the solution, but based of the description I would make sure the injector (s) or regulator haven't failed.
Low pressure could be a sign of a bad pump, clogged filter, or a stuck injector. On the TPI, the pressure will stay up. You may have to plug or crimp the return line to hold pressure in the X-fire system. If it can't hold pressure with the return line blocked off, you probably have an injector stuck open.
Last edited by KyleF; Jan 31, 2020 at 07:40 AM.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
If you turn key to run does fuel drip fro. Injector(s)? Do the injectors "click"? To check fuel pressure gauge has to be "T" in, there is no Schrader valve. Should be 9-15 psi. regulator is part of TBI. Check MAP sensor connector terminals can get deformed or wire could break at terminal. Access to scanner or datalogger to see what sensor inputs to ECM are would be handy.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
My 1984 is dumping way to much fuel it is spraying but a lot won’t run unless you are driving I have replaced the ECM and the temp control sensor and the map sensor it did it once before but when I drove it it stopped and ran great for a couple months and then it started again and it still is I need help the only code it shows is bad map sensor but I have tried three different ones
