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Author
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Topic: sputtering at low rpm
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diablounicorn
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Member # 13033
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posted
 
 
Im having problems in the low rpm, the car is sputtering when pulling off i say 500-1500rpm. it breaks up around 2000rpm drive ok then sputter again, i dont know how to explain it. idle is fine at 750rpm checked with timing light, timing at 13 degrees. i'll make a video.
mods ported gt40p heads and intake manifold, TFS1 cam, ford racing headers, stock aod transmission(supposely shift kit), stock gears i assume, throttle body and maf is stock, walbro 255 pump just put on.
Posts: 346 | From: San Diego | Registered: Jun 2013
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NK2186
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Member # 12319
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posted
Unplug the MAF and see if you can run the engine without it. should let you rev up without sputtering if you do
Try cleaning the MAF also. Friend had the same problem on his car. Unplugging the MAF let him rev and drive without sputtering but it will dump a lot of fuel and run rich
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90 LX 5.0 - Stolen/stripped
89 LX 5.0 - Stolen and missing as of 7-24-13. LIC# 4HIP151 :(
99 Cobra
00 Exploder
Posts: 400 | From: Haystack | Registered: Aug 2012
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diablounicorn
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Member # 13033
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posted
It didn't sputter as much unplug maybe should try it with the car fully warmed. Plugged it back in it sputter more as the car got warmer. Thanks
Posts: 346 | From: San Diego | Registered: Jun 2013
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redvenom
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Member # 12651
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posted
Mabee a vacuum leak try spraying carb cleaner around vacuum lines and around the intake to find the leak be careful tho...
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1990 Gt
Some what stock
1993 GT vert-(stolen)
Posts: 623 | From: cali | Registered: Dec 2012
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diablounicorn
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Member # 13033
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posted
Any other method? I'm scared to do that and catch fire
Posts: 346 | From: San Diego | Registered: Jun 2013
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8n0tch9
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Member # 10543
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posted
I had the wrong vacum lines going to my egr an It was makin car run like shit so i disconnected an capped it off runs like new now
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89 notch sold
88 gt sold
86 lx hatch 308 gt40p tremec sold
93 gt black widow project in making
80 notch I-6 beast
Posts: 204 | From: antioch | Registered: Dec 2010
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92_5.0
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Member # 7624
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posted
From your original post, it sounds like your not sure if your transmission has a shift kit or not. If it shifts hard from first to second gear and/or barks the tires, you've got a shift kit installed ![[patriot]](graemlins/patriot.gif)
Posts: 1629 | From: bay area | Registered: May 2007
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92_5.0
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Member # 7624
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posted
try replacing your fuel filter (cheap/easy job)
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Infineon/Sears point? same difference!
11.8 @ 115 mph @ Sac Raceway
411 rwhp 402 trq (old set up)
540 rwhp 517 rwtrq (new set up)
ET's to come
Posts: 1629 | From: bay area | Registered: May 2007
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diablounicorn
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Member # 13033
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posted
it shifts fine, just sputters. fuel filter and pump are new.
ill see if caping the lines will do, because im still confused on the explorer intake vacuum line compare to the stock.
my two last guesses is intake gasket, read felpro tends to leak and car sputter.
my other guess is the cracked canister line.
Posts: 346 | From: San Diego | Registered: Jun 2013
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redvenom
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Member # 12651
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posted
Test for vacuume leak first
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1990 Gt
Some what stock
1993 GT vert-(stolen)
Posts: 623 | From: cali | Registered: Dec 2012
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diablounicorn
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Member # 13033
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posted
did the test even didnt rev up but i did find a nice hairline crack on the intake manifold and water coming out.
Posts: 346 | From: San Diego | Registered: Jun 2013
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diablounicorn
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Member # 13033
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posted
fixed intake, cleaned maf, installed my 70mm tb, and no vacuum leak. still sputters
Posts: 346 | From: San Diego | Registered: Jun 2013
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