SUPERDUTYD Posted October 27, 2004 Report Share Posted October 27, 2004 i have a 92 z34 with the 3.4 that runs fine until about 4000 rpm. after that it stumbles and won't go any faster. it almost seems like the tranny. would the rev limiter kick in if the tranny was slipping? i don't think its the tranny though. any help appreciated. Quote Link to comment Share on other sites More sharing options...
jimmy91444 Posted October 27, 2004 Report Share Posted October 27, 2004 fuel filter or pump Quote Link to comment Share on other sites More sharing options...
stockgp Posted October 27, 2004 Report Share Posted October 27, 2004 fuel filter or pump i agree Quote Link to comment Share on other sites More sharing options...
SUPERDUTYD Posted October 27, 2004 Author Report Share Posted October 27, 2004 i hope not. i just replaced the pump and filter. is there a way to buy the entire pump assembly? could it be low on gas, like maybe i bent the float lever in the tank? Quote Link to comment Share on other sites More sharing options...
stockgp Posted October 27, 2004 Report Share Posted October 27, 2004 i hope not. i just replaced the pump and filter. is there a way to buy the entire pump assembly? could it be low on gas, like maybe i bent the float lever in the tank? could be low on gas. are you throwing codes? if not the fuel pump/filter, i would suspect injectors or plugs/wires. Quote Link to comment Share on other sites More sharing options...
SUPERDUTYD Posted October 27, 2004 Author Report Share Posted October 27, 2004 no codes. i wasn't too happy with the way the new pump went in. kind of just slid in there. didn't seem to be retained too well. Quote Link to comment Share on other sites More sharing options...
stockgp Posted October 27, 2004 Report Share Posted October 27, 2004 the gas tank has a cam lock on it similar to the brake booster. if you just set the fuel pump in, then there is your problem i would say... Quote Link to comment Share on other sites More sharing options...
SUPERDUTYD Posted October 27, 2004 Author Report Share Posted October 27, 2004 i meant the actual pump itself in the pump assembly. the entire thing is locked into the tank good. Quote Link to comment Share on other sites More sharing options...
stockgp Posted October 27, 2004 Report Share Posted October 27, 2004 i meant the actual pump itself in the pump assembly. the entire thing is locked into the tank good. oh i see. it's been well over a year since i did my pump, so i don't exactly remember how it's suppsed to sit in the assembly. Quote Link to comment Share on other sites More sharing options...
midnight rider Posted October 27, 2004 Report Share Posted October 27, 2004 it should fit snug. You may have some gunk in the fuel pick upfor the pump from doing the instal or have something in the tank or lines. Quote Link to comment Share on other sites More sharing options...
gp90se Posted October 27, 2004 Report Share Posted October 27, 2004 I have 2 other suggestions: A) spark plugs fouled (threefours z34 car) had no power above 4k at all, put in new plugs and the original spunk came back neutral safty isnt disengauging so when you hit 4k, it bounces off the rev limiter, rare but it happens Quote Link to comment Share on other sites More sharing options...
SUPERDUTYD Posted October 27, 2004 Author Report Share Posted October 27, 2004 thanks everybody. i will hook up a fuel pressure gage and check the spark plugs. i hope it's the plugs. Quote Link to comment Share on other sites More sharing options...
Gemmer Posted October 27, 2004 Report Share Posted October 27, 2004 Does it vibrate, or just no power? The tensioner for your timing belt might be going and let your cams slip out of timing Quote Link to comment Share on other sites More sharing options...
loominaz34 Posted October 29, 2004 Report Share Posted October 29, 2004 How hard is replacing the filter/ pump? I'm having the same problem on my Z. Quote Link to comment Share on other sites More sharing options...
Bolt_Crank Posted November 10, 2004 Report Share Posted November 10, 2004 I have 2 other suggestions: A) spark plugs fouled (threefours z34 car) had no power above 4k at all, put in new plugs and the original spunk came back neutral safty isnt disengauging so when you hit 4k, it bounces off the rev limiter, rare but it happens Park/Neutral rev limiter is @ 3k Quote Link to comment Share on other sites More sharing options...
HokemBokem Posted November 10, 2004 Report Share Posted November 10, 2004 Do you know when you last had a spark plug change? You should try those first since its cheap and some people on here have had that problem. Quote Link to comment Share on other sites More sharing options...
loominaz34 Posted November 10, 2004 Report Share Posted November 10, 2004 I dont think it's the rev limiter because at 25 MPH, I can rev in neutral to 6500. (found that out by accident :shock: ) Quote Link to comment Share on other sites More sharing options...
excelsior Posted November 11, 2004 Report Share Posted November 11, 2004 do a spark plug change & see what happens....failing that fuel pump.....my prix had that problem (fuel pump) Quote Link to comment Share on other sites More sharing options...
loominaz34 Posted November 11, 2004 Report Share Posted November 11, 2004 Okay so again I ask, how hard is the fuel pump/ filter change? Quote Link to comment Share on other sites More sharing options...
gpse_97 Posted November 13, 2004 Report Share Posted November 13, 2004 I dont think it's the rev limiter because at 25 MPH, I can rev in neutral to 6500. (found that out by accident :shock: ) in park\neutral when not moving the limit is 3000RPM, when moving about 5mph in neutral there is no limit. Quote Link to comment Share on other sites More sharing options...
excelsior Posted November 13, 2004 Report Share Posted November 13, 2004 i ask how comprehensive is your mechanical skills? Quote Link to comment Share on other sites More sharing options...
loominaz34 Posted November 13, 2004 Report Share Posted November 13, 2004 My mechanical skills are at least good enough to set the timing belt. Quote Link to comment Share on other sites More sharing options...
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