Intake manifold swap problems
Thread Starter
Teching In
Joined: Nov 2013
Posts: 35
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From: GA
Intake manifold swap problems Ok i just finish swapping my stock ls1 intake manifold out for a PP 96mm intake with high flow fuel rail and a 92mm ebay throttle body. The problem is the car won't idle or stay running unless I unplug the maf (which is still the stock 1) then with it unplugged it idles at 2000rpm. My new throttle body doesn't have a hole in the blade, so i adjusted the screw to slightly open the blade and it idles with the maf plugged up but it sputters, cough, and runs extremely rough. Myquestion is does the car just need to be tuned or maybe another problem? It is a 98 z28 with a lq9 short block, 806 heads, full exhaust (ory). Its ben tuned for the 6.0 but it was already running rich before the swap, is it the tune???
could be quite a few things. unfortunately the PP intake sometimes has leaks around the gaskets I would try spraying carb cleaner at the base of the intake flanges and see if the idle changes. If that checks out then look at the tb and check the shaft, with the cheap ebay tb's lots of people report problems with idle issues like you have, same with some PP intakes. Check all that stuff and report back, it def should idle ok without a tune, driving is another story
Restricted User
Joined: Mar 2014
Posts: 7,192
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From: Ohio
Test for vacuum leaks. Do what redbird said, grab some carb cleaner or starting fluid and see if you can get it to rev up spraying around the gaskets or throttle body.
The problem is likely in the throttle body. You may need to drill a small hole and back the idle screw back down to where it was before.
The problem is likely in the throttle body. You may need to drill a small hole and back the idle screw back down to where it was before.
Thread Starter
Teching In
Joined: Nov 2013
Posts: 35
Likes: 0
From: GA
could be quite a few things. unfortunately the PP intake sometimes has leaks around the gaskets I would try spraying carb cleaner at the base of the intake flanges and see if the idle changes. If that checks out then look at the tb and check the shaft, with the cheap ebay tb's lots of people report problems with idle issues like you have, same with some PP intakes. Check all that stuff and report back, it def should idle ok without a tune, driving is another story
