LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Hesitation off idle

Old 01-27-2002, 03:16 AM
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Post Hesitation off idle

I know that this has beem talked about way to much, but i am going to give it a shot anyway. I have been having a slight hessitaion right off idle for some time now. It seems that the car is bogging down, but once it reaches 2000rpm's it kicks in and goes like crazy. It does not stumble, just hesitates. It is starting to get on my nerves. What can i do to fix it. Is the coil bad? I replaced the plugs and wires 6000 miles ago. they are fine, no burns or corrosion. I did not however but any die-electric stuff on the boots when I but them on. Counld this have something to do with it. Any suggestions would be great. Thanks a lot. Car is in the sig.

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94 Z 28 M6. 6 point role cage, Hurst short throw, cold air intake with K&N filter, 2000 TA rims, series 80 Flowmaster, 500 watt JBL amp for the highs, nakamichi CD-45Z head unit, JL all around.
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Old 04-20-2002, 04:26 PM
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I am having the same problem too. So far I have changed plugd, wires, opti, coil, and every small vacuum leak I could find to no avail. I would like to find it too. Maybe injectors or fuel pump?? I am stumped also. I was running 8.8 in the 1/8 before this started to now 9.2. That is what I was running stock!!!

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96 Z-28 Moroso CAI, Flowmaster, cut-out, TB bypass, air foil, GMS LCAs, Nitto 555R, LT4 KM, 1LE Intake Elbow
8.89 1/8 mile 2.08 60 ft with mods
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Old 04-21-2002, 08:19 PM
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TTT for us.

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96 Z-28 Moroso CAI, Flowmaster, cut-out, TB bypass, air foil, GMS LCAs, Nitto 555R, LT4 KM, 1LE Intake Elbow
8.89 1/8 mile 2.08 60 ft with mods
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Old 04-21-2002, 08:31 PM
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yeah im having the same problem too! i know this is very very VERY common and nobody seems to know why the hell these cars do it. if i lay on the throttle in 1st, the car just sorta pulls forward till it hits 2k where it starts to shred the tires and totally redeems itself but still pisses me off

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1997 Z28 M6
T-tops, chrome rims, all options, SLP "Loudmouth", !CAGS, FIPK, LT4 KM, !MAF descreen, Air Foil, TB bypass, pro 5.0, TR55s, OBD1, !EGR, !AIR, CSI waterpump, 160* thermostat
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Old 04-21-2002, 08:38 PM
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Mine does it too. It only started recently.

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1994 Z28 - A4, 3:23, MTI 52mm TB, CAI, 1LE Bellows, Whisper MAF ends, Pacesetter Coated Shorties, Edelbrock Cat-back, LT1 Edit, LT4 KM, !CAT, !AIR, !EGR, Cross-drilled Rotors, SLP STB
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Old 04-22-2002, 10:50 AM
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WEll, we have more with the same problem but no one who knows why. I am gonna start testing my whole fueling system. It has to be something small we are all overlooking.

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96 Z-28 Moroso CAI, Flowmaster, cut-out, TB bypass, air foil, GMS LCAs, Nitto 555R, LT4 KM, 1LE Intake Elbow
8.89 1/8 mile 2.08 60 ft with mods
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Old 04-22-2002, 11:15 AM
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Change your fuel filter. Mine was hesitating off of idle...it would rev up, then bog and drop RPMs, then rev again and drive OK. Changed the fuel filter and everything was peachy again. It's like an $8 part and it only takes about half an hour to change, so go for that first and see if it fixes your problem.

By the way, the fuel filter is a "change every 10K-15K miles" part, so don't overlook it in the future when you're under there wrenching away at stuff trying to fix a problem.

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Jeff L...1994 Camaro Z28 A4...stock for now

[This message has been edited by Type_O_Negative_1320 (edited April 22, 2002).]
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Old 04-22-2002, 02:53 PM
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I have already changed my fuel filter so I do not think it is that. I put on a WIX. I am gonna check all my injectors sometime soon and see if they are all working properly.

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96 Z-28 Moroso CAI, Flowmaster, cut-out, TB bypass, air foil, GMS LCAs, Nitto 555R, LT4 KM, 1LE Intake Elbow
8.89 1/8 mile 2.08 60 ft with mods
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Old 04-22-2002, 06:15 PM
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I have this same problem.

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Delaney Grady <----- This site Ghetto Tour Guide!

'94 z28/white/t-top/6spd

"Rice is like ****. There's no definition for it, but you know it when you see it."
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Old 04-22-2002, 07:09 PM
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Bet you $50 that an O2 sensor is bad

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Slow. Real slow......
94Z M6
Eighth time: 8.32
Eighth MPH: 88.37
Street Tires
Can't afford the 125 shot
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Old 04-22-2002, 07:31 PM
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It's not o2s. I just put new ones in. It's not the fuel filter. I put a new one of those on a while back too. I'm going to play with the IAC throttle follower and idle speed tables on LT1 Edit and see what happens.

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1994 Z28 - A4, 3:23, MTI 52mm TB, CAI, 1LE Bellows, Whisper MAF ends, Pacesetter Coated Shorties, Edelbrock Cat-back, LT1 Edit, LT4 KM, !CAT, !AIR, !EGR, Cross-drilled Rotors, SLP STB
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Old 04-24-2002, 02:39 PM
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I also have new O2 in mine so that is out of the question on my car also.

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96 Z-28 Moroso CAI, Flowmaster, cut-out, TB bypass, air foil, GMS LCAs, Nitto 555R, LT4 KM, 1LE Intake Elbow
8.89 1/8 mile 2.08 60 ft with mods
AOL IM: jwc3382
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Old 04-30-2002, 06:18 PM
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I have a 94 six speed and it's recent'y decided to start the same hesitation that you guys are describing. I have had some nasty ignition problems recently so I have replaced the plugs, wires, coil, distributer, basically EVERYTHING in the ignition and now it has that hesitation in first every so often. I just wanted to know if any of you guys figured out what the problem is yet???
any help is great.
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Old 04-30-2002, 06:35 PM
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mine has a little hestitation when i first turn on my car in the morning. i back out of the garage than put it in D and i hit the gas and it hestitates like its going to die?
maybe its the tps sensor?

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93Z28 A4, MAC headers, 3" cut out, home made CAI, TBB, Power Chip My Z
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