88 5.0 won't run

stangman · 02-22-2010, 04:42 PM

GOT HER FIXED!! She is a mass air car now. Ok, long story short. Got a 88 5.0 5 speed car that everybody in the world has worked on. Owner said it stop firing. It is firing and has 40 psi at fuel rail. It has power at the injectors. The computer, distributor, pick up, fuel relay, fuel pump, wires, plugs, fuel injectors, fuel injector harness, switch, fuel pump, have all been replaced. It has about 100 TO 120 compression on each cyclinder. It is in time and the wiring is correct... Some times it will start and run for about 5 seconds and it hits while it is turning over. WTF is wrong with this POS?

coupe · 02-22-2010, 04:45 PM

More details... does it prime the fuel pump for a couple seconds when you turn the key? Then when it does fire, is the pump still running? You said you put a new computer... but was it really new, or just a junkyard one? Computer was my first thought.

93cobra1928 · 02-22-2010, 04:49 PM

Have you checked for 5v reference on all the sensors and checked the EEC relay?

swammi · 02-22-2010, 05:53 PM

check the ground from the battery to the computer/ body ground its the one next to the battery it is a round shaped plug i had a similar problem and that was all it was!

QWKSNKE · 02-22-2010, 06:11 PM

Has somebody changed the cam in it?

stangman · 02-22-2010, 06:13 PM

Quote:

Originally Posted by QWKSNKE

Has somebody changed the cam in it?

No cam change.

stangman · 02-22-2010, 06:15 PM

Quote:

Originally Posted by coupe

More details... does it prime the fuel pump for a couple seconds when you turn the key? Then when it does fire, is the pump still running? You said you put a new computer... but was it really new, or just a junkyard one? Computer was my first thought.

It does prime. The pump runs when the car fires and it keeps 40 psi. It is a reman computer. I also took one from a running car and tried it.

stangman · 02-22-2010, 06:17 PM

Quote:

Originally Posted by 93cobra1928

Have you checked for 5v reference on all the sensors and checked the EEC relay?

Have checked the 5v but have not changed the EEC relay. I was told it had been changed. I will try another one.

stangman · 02-22-2010, 06:18 PM

Quote:

Originally Posted by swammi

check the ground from the battery to the computer/ body ground its the one next to the battery it is a round shaped plug i had a similar problem and that was all it was!

Grounds have been checked and they all are hooked up.

QWKSNKE · 02-22-2010, 08:09 PM

Jerome, Have you removed the front cover to make sure that the timing sprockets are where they should be?

02-22-2010, 04:42 PM	#1
stangman Senior Member Join Date: Oct 2007 Location: Wedowee, AL Posts: 515	88 5.0 won't run GOT HER FIXED!! She is a mass air car now. Ok, long story short. Got a 88 5.0 5 speed car that everybody in the world has worked on. Owner said it stop firing. It is firing and has 40 psi at fuel rail. It has power at the injectors. The computer, distributor, pick up, fuel relay, fuel pump, wires, plugs, fuel injectors, fuel injector harness, switch, fuel pump, have all been replaced. It has about 100 TO 120 compression on each cyclinder. It is in time and the wiring is correct... Some times it will start and run for about 5 seconds and it hits while it is turning over. WTF is wrong with this POS? Last edited by stangman; 02-28-2010 at 04:05 PM. Reason: Fixed.. Ecm harness bad

02-22-2010, 04:49 PM	#3
93cobra1928 Dazed and Confused Join Date: Mar 2009 Location: Northport, Al Posts: 778	Have you checked for 5v reference on all the sensors and checked the EEC relay? __________________ Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards

02-22-2010, 05:53 PM	#4
swammi magnaflow lover Join Date: Nov 2009 Location: pisgah al Posts: 150	check the ground from the battery to the computer/ body ground its the one next to the battery it is a round shaped plug i had a similar problem and that was all it was! __________________ 97 f150 lariat excab tow rig 93 mustang gt under construction

02-22-2010, 06:11 PM	#5
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Has somebody changed the cam in it? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

02-22-2010, 08:09 PM	#10
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	Jerome, Have you removed the front cover to make sure that the timing sprockets are where they should be? __________________ 2009 Porsche Carrera S 2008 ///AMG C63.. Eurocharge Tune. RIP 2019 AMG GLC43..wife's 03 F250 SD.. Edge Evo, AFE Stage 1 CAI 08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's 01 Cobra vert... wife's I need a new toy

02-22-2010, 04:45 PM	#2
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	More details... does it prime the fuel pump for a couple seconds when you turn the key? Then when it does fire, is the pump still running? You said you put a new computer... but was it really new, or just a junkyard one? Computer was my first thought.