Help me 4age GURUS read this! red top-blue top engine swap..

[SkunkWeRX]

ok just finished putting a blue top into a 89 fxgt,previouly had a redtop in her.started her up idles ok ,as soon as you give it revs is splutters and back fires out the airfilter.. at idle the enigne lite doesnt come on when u rev it,it comes on..
tried everything me and my mate can think of...
changed spark plugs injectors etc... done everything.. and were stumped as to the problem.
if this help we removed the 100 kw intake coz it wouldnt fit the blue top head....running blue top intake now but still running like crap... the engine seems healthy as.
any help would be great!:)

[Lloyd]

MAP sensored? Possibly not plugged in or has a leak. Sorry, not much help really

[EVLGTZ]

might be due to using a redtop ecu. need someone to confirm it will work with bluetop setup....

[SkunkWeRX]

map sensor is plug in... tried two different ones same fault still..
went to try bluew top ecu,completly different plugs..
any thing differnt from the 100kw redtop ecu is a normal redtop ecu??/

[gdsup]

you need to use the redtop injectors and all the sensors, Have you got the spark plug order correct?

[SkunkWeRX]

ok sweet as red top injectors i'll use them. what sensors aare meant to be used ??? im sure they all are apart from the knock sensor as there isnt a place in the block for it???

[RedMist]

I thought the triggering on the smallport was different to the bluetop? Vvega has more details, but if its anything like he suspects then you may have to swap out the dizzy as well.
Another thing to think about before you just swap over the injectors is where the resistor is.. I have no idea on a standard 4age as my bluetop runs a Link. The reason I mention resistor is the fact that the injector resistance has changed from blue to smallport.
You'll also have issues with it being out of tune as the 100kw smallport flows differently than the bluetop, as such will have a different ignition and fuel curve.

In effect you need to run all sensors, wiring loom, ecu, injectors, fpr designed for your engine.

You might be better off in this instance attempting to get a bluetop ecu and wiring the car to suit.

[ChaosAD]

Bluetop doesnt have resistors, just fat wires back to ecu. Unless the resistors are on the power side.
You said it comes up with a fault code. Have you checked what the fault code is? that should tell you whats wrong.
BTW, was the old engine redtop? or red/blacktop with TVIS written in the intake manifold? If there is a plug for the tvis then it must have been red/blacktop

[RedMist]

Whats the bet the code is O2.

[SkunkWeRX]

umm ok,heres some new info,if i take the 4th plug lead off the injector it seems to runs better??
burnt valve??? or what??? also had a slight noise when ideling with them all on like a arcing noise every now and then....kinda clicking.

[ChaosAD]

If the check engine light flashes then check the fault codes.
Try measuring the resistance on eack of the injectors too.

[crispy'86]

should have injector resistor in the system. I tried to run my ae92 and forgot to plug in earth for it . ran soooo rich!!!!!!!
Try your earths for security, although they are slightly different set-ups i made that mistake