OK so I did the top swap on my GP today and am having some problems. The car is running at 4000 RPM in park and 2000 RPM in gear. Below are the mods I have.

1997 Grand Prix SE
Heads drilled for GTP injectors
Stock SE MAP and MAF (both brand new)
Shorty intake
Ported S/C
Ported LIM
3.5 inch pulley
180 degree thermostat
ZZP tune (They say it was tuned for the stock maf and map)

Now I have a feeling it's a issue with the PCM tune as I can't find any vaccuum leaks. I drove the car for 10 to 15 minutes and it's showing up to 5 psi on the boost guage and feels kinda dogish. It is faster but not what I was expecting at all. The idle did kick down just as I was pulling into my driveway but then it wanted to die. I did pull MAF sensor connector and it just died. Any adive would be appreciated!

-- Fri Jun 24, 2011 3:09 pm --

Ok so I just swapped in a spare stock PCM and the idle is still at 4000 RPM so what else could it be?

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

And by se I am assuming 3800. ( being you did a top swap)


Any other mods? Pully is kins small for high compression on stock cam and or minimal mods.


Try unpluging maf and see how it runs.

Have the file read and confirm that all is right. Be gentle on it till you get it figured out or you may be replacing some things.

sent from my driod x, via my fingers through tapatalk

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Pulled the MAF and it died. Pulled the MAP and no change.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

unplug the idle air control and see what happens. even take it out and see if there is any thing loged in it cousing it to stay open

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Just went out and pulled the IAC and no change. I had already swapped it to see if there was an issue. While I was out there I pulled the MAF again and the RPMs dropped to a somewhat decent idle for 10 seconds then jumped then dropped again for another 10 seconds or so.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

hmm

bad crank sensor? ot a huge vacuume leak

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

did you do an egr delete?? if so check to be sure that the huge hole in the lower intake is plugged.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

The car was running fine before the top swap so I doubt that the crank position sensor is bad. Could be a vacuum leak but I can't find it. I did not do the EGR delete but I wonder if the EGR tube to the manifold has a crack? Just checked the TPS and swapped it for a spare for the hell of it but same problem. Will look for vacuum leaks but with it at such a high rpm can't really decern more rpm from carb cleaner.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

i would not rule the crank sensor out becuase the ballancer has to be changed and if the tabs are not exact could damage the crank sensor.

does not hurt to double check


carb clean only helps with small leaks this is a big one and would be noticeable

is the PCV valve actualy in the SC and is it seated corrctly?

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

I used the ZZP SSM90 kit so I didn't change the balancer. I am starting to suspect that the way the heads were machined for the fuel injectors is causing a vacuum leak. I am going to check it out tomorrow as it is raining now.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

sense the heads had to come off to be drilled why did you not just get l67 heads?

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

I had thought about it but when I took the heads to be machined they told me $150. I figured I would've had about that for L67 heads. However when I picked the heads up they charged me $200. Money's been spent so now I'm stuck with them.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

Get some real L67 heads! I've always hated the idea of the ZZP "kit" in the first place and it's silly to machine heads to make them work when you could get used heads for the cheaper/same price.
Also aren't the MAP sensors different on the L67's and L36's (different Bar readings?) so perhaps that is also causing some problems.
I'd also be putting a bigger pulley on it until you get the running issue figured out first.
For the idle to be that high you'd have to have a pretty darn big vacuum leak though so I'd see if I could find something with a tuner to take a look at what the ZZP tune is doing and if it's even reading all the sensors correctly. Other than what's already been mentioned, I'm not quite sure what it could be, sorry.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

What kit did you do the true ss kit uses a l67 intake and puts the injectors in the intake so the stock l 36 heads can be retained

sent from my driod x, via my fingers through tapatalk

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

I used the SS90MPS hub and pulley

_________________
Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

matt the L36 has a 1 bar map it can only read up to atmusphere and vacume

the L67 map is a 2 bar it can read vacuume and 2 atmospheres or 14.7psi of boost


if it was tuned for your stock map the fueling will be off when you hit boost as that is what the computer uses it will eather run lean at WOT or rich. seeing as it's a zzp tune they probably went rich for safety

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

^^Thanks for clearing that up Tom. That's what I thought but I wasn't sure.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

yup the map would not couse this issue though even if it was bad

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Ok so I found the problem. Pulled all the injector connectors and turned the engine over while spraying carb cleaner. Well it runs on carb cleaner! I pulled the injectors and found that there were marks on the injectors where the chamfer the machine shop put on the holes was causing the injectors not to reach into the holes enough. I releifed the injectors and put it all back together. Now from the looks of it the injectors fit in better. And of course I broke the damn plastic fuel line fitting. I need to go grab one and test this thing out again.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

sounds like the ss intake or the l67 heads would have been a littl more trouble free.

hope that takes care of it for ya though.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

You're right they would be more trouble free at this point and the manifold is probably in my future but as this is my dd I need to get it running for now at least.

_________________
Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

This just reinforces my thoughts on the SS "kit" being a waste of money when you could do a real top swap without this much headache especially when full series II top swap can be had for a couple hundred bucks minus gaskets.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

yup when i did the top swap on the 01 i thought of using a SSM90 kit but you can only go to a 3.2" pulley any smaller you need to get the L67 belt drive any way

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

I plan on picking up a used L67 and building that while I drive this one then swap them once I'm happy with the build. I started this build before I found this site. If I had I probably went the other route.

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Bryan,

1997 GP - Heads drilled for injectors, 98 ported s/c, ported lim, CAI, 3.5 Pulley, ZZP Tune, 1.75 In Primary and 2.5 In Collector headers, 3 In high flow cat, Autolite 104 coppers, MSD streetfire wires and blaster coil packs, my own poly upper motor mounts

remember too that the l67 will have lower compression than what your dealing with now, depending on how big your going it may or may not make a difference. on which bottom end you use

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock