blasterman87

91 hatch full eg harness( i didnt do this) mild lsv build tuned on crome walbro fuel pump stock 240 injectors. All obd1. Now this is wierd. It shows no codes untill i try to run it past 7.5k twice. Yes the first time it will rev out to 9 but after u drop below 7.5 and tach it out the second time the injector code comes up and it will not rev past 3.5 (limp mode) untill i shut it off and restart then the codes gone n it will rev fine till u tack it out again. Ive changed injectors to known working ones and all the wires seem to b good.. any ideas? Thanks

Red-Rocket

My advice is to not spin up to 9k with an LS block unless you have arp rod bolts at a minimum and thicker rods, try another ecu is my guess

Red-Rocket

Or get larger injectors (nothing crazy) like 330cc and retune then see if you have the same problem

blasterman87

Could it be maxing out the injectors at the higher rpm's? I dont know the history of the tune but i know its a chipped p28.

Dioxine

Are you sure they are 240cc injectors? Sounds like your maxing them out. What's codes are you getting exactly.


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blasterman87

Yes stock 240. And code 16. Fuel injector.

b19coupe

The code can be disabled in Crome.

blasterman87

So i need bigger injectors and have re tuned?

Dioxine

Im not sure what hes referring to im not familiar with Crome. But if you have 240cc injectors and a decent tune it shouldnt be running out of injector, you might be on the high side of fuel pressure for them to be efficient but they should still have room.

hybridmiklo

pull out your dmm and check the resistance on all injector and compare them to spec. Do a cylinder balance test and disconnect one at a time to see if a cylinder doesn't contribute. \. Also, are you using an obd1 ecu?

blasterman87

Yes obd1 p28. All injectors are in spec as far as ohms. Could it be a fuel pressure problem? Its the stock fpr.

hybridmiklo

no. its in the injector circuit. Now what were the resistance readings? there is a possibility you have obd0 injectors instead of obd1.

Dioxine

Wont obo0 injectors not fire without a resistor box?

blasterman87

There obd1 injectors. I know because ive tried several diffrent sets

HiProfile

The injector test (which you can disable in crome) checks to see if there are acutal injectors on each circuit, or if the drivers are working. My guess is to check the clips (especially the pins inside them) and the "dead end" cannon plug behind the driver's shock tower. At high RPM there could be enough vibration where a clip is rattling loose enough to trigger the code.

FYI 240cc injectors tend to max out around 160whp at the stock 3bar fuel pressure, so I wouldn't try pushing them as hard as you are. If you spent enough money to spin to 9k safely, $200 on a set of new injectors isn't going to hurt.

hybridmiklo

of course obd0 injectors will fire. they will have less resistance than an obd1. But also what hiprofile says is a huge probability. Had the same problem on the dyno at bisimotos. one injector clip would somewhat vibrate and give an open which lead to one cylinder going super lean.

blasterman87

Is there a way to manually bypass this sensor sence jdm ecu's dont even have the hardware for code 16

blasterman87

Figured it out. Jad 2 obd1 injectors and 2 obd0's