Need some help I am going crazy

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scheffler
Posts: 473
Joined: Wed Feb 23, 2005 3:10 pm
Car: 92 240 KA-T
92 300zx TT
97 Tahoe
Location: San Diego

Post

Ok my car is hicuping at idol and when I give it gas I gets worse. I have checked the fuel system, MAF, vacume is at 20 inhg, fule pres is 25psi, the hicups are about once a seond or two. I am just about out of ideas so I am asking for some assistance. It started when I was driving down my street and I guned it to about 4500 rpms in first then it started to hickup really bad and I took it home it has been like that ever sence. If you guys can think of something or have an input please let me know.


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1995240sxSE
Posts: 847
Joined: Wed Jan 11, 2006 1:47 pm
Car: 1991 jeep wrangelr and a 2004 ford taurus

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have you tried a general tune up air filer oil filter fuel filter plugs and wires?

SeVa-S13
Posts: 8478
Joined: Thu Jan 23, 2003 9:11 pm
Car: '05 GTO 6spd

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With vacuum, Fuel Pressre should be 35-ish I believe. 43psi without vacuum. I dunno if your 25 was a typo, just figured it was worth a shot.

scheffler
Posts: 473
Joined: Wed Feb 23, 2005 3:10 pm
Car: 92 240 KA-T
92 300zx TT
97 Tahoe
Location: San Diego

Post

No 25 wasn't a typo when I got my FPR it said it should be 25 but if the is wrong than I will have to see.

KATwo40
Posts: 1761
Joined: Tue Feb 01, 2005 9:40 am
Car: 1993 240sx KA-T

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Yep...should be @ 35psi with full vacuum.

scheffler
Posts: 473
Joined: Wed Feb 23, 2005 3:10 pm
Car: 92 240 KA-T
92 300zx TT
97 Tahoe
Location: San Diego

Post

so that would cause it to sputter

SeVa-S13
Posts: 8478
Joined: Thu Jan 23, 2003 9:11 pm
Car: '05 GTO 6spd

Post

If your fuel system isn't at full pressure, there's probably less fuel being injected, causing a lean condition which very well may cause sputtering. The fuel being injected will also not be as atomized as it should be with less-than-ideal fuel pressure...

scheffler
Posts: 473
Joined: Wed Feb 23, 2005 3:10 pm
Car: 92 240 KA-T
92 300zx TT
97 Tahoe
Location: San Diego

Post

well its running rich. I have tried everthing I can think of to fix this problem new air filter, compresion is 150 across the board have check for any type of seals or bad connections any one have any more ideas.

dontbugme
Posts: 81
Joined: Wed May 18, 2005 8:06 am

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Is your ecu throwing any codes? What exactly do you mean by a hic-up, is it a backfire or more like a stumble when it almost dies. Does it ever go away? Could be a vacuum or intake leak, check all your hoses. How do the plugs look?


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