89 XJS ran fine now dosnt start injectors not opening? IM stuck is my only car please help

89XJSMAZDAMAN

MEMBER
1989 JAGUAR XJS
110,000 MILES

Bought this car recently had hole in gas tank I fixed the tank cleaned it replaced it car then started but the fuel pump always stays on cycling but it worked fine fired right up started everytime for me after that I drove it 70 miles to get inspected done and after leaving there it started rough but started and leveled out I drove to a friends stayed 15 min car barely started its trying but seemed flooded so I got it home discovered gas in both vac lines to the regulators I replaced both regulators and fuel filter turnt key on and trued to start it turns but didnt even try to fire I found about 8 ground wires on both sides of the radiator at top groups of groynd wires were loose both sides I tightned em and fired up I figured was flooded but 2 days later I go out it fires right up I was like cool ok. Everything worjed seened fine I let it warm up fully heat and all I shut it off and restarted like 4 times and one being 10 min inbetween it fired right up I drove it to a friends house and ten min later wouldnt start At all fifured flooded again so let it sit for a whole day and still nothin it turns over all lights work has fuel psi no gas in vac lines gas psi in rails can hear it returning to tank if I listen I sprayed starter fluid in both sides to check for spark it fires right up so is efi ground issue? Or the ecu? Any help is greatly appreciated im low on $ and this is my only car at moment 7174199811 and replys or call would be helpful would like to have my car for the new year have a kid and all I need help just is too nice a car to junk great shape but keep having these issues ever since I tightned them wires it all worked then just wouldnt starts has spark and all like I said just no life or gas of its own names ed ar rotary custom please please help happy new year god bless

1 Reply

HMAC300

MECHANIC
48,601 POSTS

Check the fuel pressure it should be 36 psi. Make sure your grounds that you tightened are clean as well as tight. Also there should be a good ground to body and engine. If you can spray choke cleaner in engine then it's probably a fuel problemif not it's ignition. Check primary coil resistance it should.9-1.1 ohms. If you dont' know how to do it, it is listed under repair on the site here. Injector resistance is 2.4 ohms at room temp. Also check for auxillary air valve malfunctionalso check the map sensor or if it has a vacuum line going to it check that for beign soft andcollapsing.
FUEL� CONTROL

CAUTION: This� test� results� in� fuel� vapor� being� present� in� engine� compartment.� All� necessary� precautions� against� fire� or� explosion� should� be� taken.

XJS� Cold� Start� System� Test

Remove� 2� set� screws� and� washers� retaining� cold� start� injectors� in� intake� manifold.� Remove� the� start� injectors� and� place� them� in� a� container� to� collect� sprayed� fuel.� Disconnect� distributor� lead� from� the� coil.

Engine� Temperature� Below� 59°F� (15°C)

1. Turn� ignition� on� and� check� the� cold� start� injectors� for� any� leakage.� Crank� the� engine� for� a� few� revolutions.� Injectors� should� spray� while� engine� cranks. DO� NOT� operate� starter� any� longer� than� necessary.
2. If� injectors� do� not� spray, � crank� engine� and� check� for� battery� voltage� at� cold� start� injector� supply� (White/Pink)� cable.� If� voltage� is� present, � check� ground� connections� and� wiring� harness� connectors� at� cold� start
injectors.� Repair� as� necessary.� If� no� defects� are� found, � injectors� are� faulty� and� must� be� replaced.
3. Crank� engine� and� check� for� battery� voltage� at� terminal� No.� 87� of� cold� start� relay.� If� voltage� is� present, � check� wiring� harness� between� relay� and� cold� start� injectors� and� repair� as� necessary.
4. Crank� engine� and� check� for� battery� voltage� at� terminal� No.� 30� of� cold� start� relay.� If� no� voltage� is� present, � check� supply� wire� from� pump� relay� and� repair� as� necessary.� If� voltage� is� present, � relay� is� not� being
energized� or� contacts� are� faulty.
5. Crank� engine� and� check� for� battery� voltage� at� terminal� No.� 86� of� cold� start� relay.� If� voltage� is� present, � relay� is� not� being� energized� or� contacts� are� faulty.� If� no� voltage, � repair� supply� wire� from� starter� circuit.
6. Crank� engine� and� check� for� battery� voltage� at� terminal� No.� 85� of� cold� start� relay.� If� voltage� is� present� and� relay� is� not� energizing, � there� is� a� problem� with� thermo� time� switch� circuit.� Disconnect� wiring� harness� from
terminal� No.� 85� and� jump� terminal� No.� 85� to� ground.� Relay� should� now� energize.� If� not, � relay� is� faulty� and� must� be� replaced.
7. If� relay� energizes, � check� for� battery� voltage� at� terminal� No.� 87� of� cold� start� relay.� If� no� voltage� is� present� at� terminal� No.� 87, � the� contacts� of� relay� are� faulty� and� relay� must� be� replaced.� Reinstall� cold� start� injectors
and� all� cables� or� connectors.

Engine� Temperature� Above� 59°F� (15°C)

1. Crank� engine� and� check� voltage� at� terminal� No.� 87� of� cold� start� relay.� Voltage� should� be� 0� (zero)� volts.� If� battery� voltage� is� present, � remove� wiring� harness� connector� from� terminal� No.� 85� of� the� cold� start� relay.
2. If� voltage� is� 0� (zero)� volts, � the� thermo� time� switch� is� at� fault� and� must� be� replaced.� If� battery� voltage� is� still� present� at� terminal� No.� 87� after� disconnecting� terminal� No.� 85, � replace� cold� start� relay.
3. If� cold� start� injectors� pass� fuel� when� no� voltage� is� present� at� terminal� 87, � the� injectors� must� be� replaced.

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