ho questions

[queeque]

Hey i have a 1988 grand marquis wagon.
I was just wondering if the mustang e7 heads and 19lb injectors can be put on without changing the computer?

and will a Lincoln LSC computer plug right into my stock wiring harness?

[gadget73]

Heads yes. Injectors no. You only need to change the ECM and injectors if you change the camshaft.

The LSC computer plugs in and works fine. Only use this with an HO cam and 19# injectors.

[queeque]

oh ok thanks.

will i be able to feel a difference with the e7 heads?

and is there a way to lock the trans into 2nd gear?

[cld783]

oh ok thanks.

will i be able to feel a difference with the e7 heads?

and is there a way to lock the trans into 2nd gear?

nope and not really... you can do the aod shuffle but its not gonna do much for you with your stock motor.

[turbo2256b]

HO cam dosent have to be used but the HO ECM and injectors do. The connections of the injectors have to be repined at the ecm WIRING HARNESS 4 cylinders must be swapped out.

[queeque]

so putting on e7 heads pointless? I just wont to put some cheap and easy mustang parts onto it to make my grand marq come alive a little bit.

[cld783]

if your gonna go far enough to do heads you might as well do the full conversion..

[turbo2256b]

19 lbs injectors, HO ECM and a HO throttle body realy does more than the E7 heads.

[queeque]

well i can get e7 heads with 20,000 miles on them for free and i figured heads would add a lot of horse power. What mods should i do then? I already aftermarket dual exhaust on it.

[cld783]

they wont add alot of horsepower they will add SOME horsepower while sacrificing low end torque. it would possibly feel slower if you did the heads alone.

do the heads and slap a cam in at the same time. then work on the rest of the parts for the full conversion to do it right..

[turbo2256b]

HO ECM, HO throttle body, repin ECM injector wires at the ECM (#4and 7 swap wires ... #3and 6) plug in. install 19# injectors. You will need a bored out EGR spacer too.

[queeque]

HO ECM, HO throttle body, repin ECM injector wires at the ECM (#4and 7 swap wires ... #3and 6) plug in. install 19# injectors. You will need a bored out EGR spacer too.

what exactly do i have to do to put the heads and cam and maybe injectors on correctly?

will i feel a change in power when these parts are put on?

[Lincolnmania]

while you have the heads off. change the cam, injectors upper intake throttle body and ecm.....theres your ho conversion.......turbos path sounds misleading

[gadget73]

I'd do the cam and convert it the right way. Re-pinning the injector harness is NOT neccesary if you use the HO camshaft. No modifications at all need to be made to the EFI wiring if you do the full conversion.

Just E7 heads with nothing else will give you a little bit, but its probably not worth the bother. If you've got it down to a shortblock, its not much more to swap the cam out. Used HO cams appear cheap on forums or on ebay all the time. Just make sure its rust-free and the lobes are in good shape. If they look like they've been attacked with a grinder or have rust on them, its scrap metal.

The E7 heads, HO cam, HO upper intake, and the HO throttle body with the bored EGR spacer make a very noticeable difference in power. Lincolnmania's black Crown Vic has that exact setup and runs a 16.30 quarter mile. Typical stock times for that car are in the high 17s or low 18s.

[88grandmarq]

my 88 MGM picked up .8 in the qtr mile from installing E7 heads and a 3.27 gear (17.7 to a 16.9)

I converted 3 cars to HO, one had a full MAF conversion then went back to SD. I have tried re-pinning the injectors before and noticed no difference either way (power or economy).

ALL of the wire diragrams I have seen, including the factory EVTM, show the pin out for the injectors is same between HO and non-HO ECM's