99 c5 corvette wont start
Thread Starter
4th Gear
Joined: May 2020
Posts: 4
Likes: 0
From: Statesville
99 c5 corvette wont start
I have a 1999 c5 corvette 6sp convertible ms4 cam ram air intake manifold 92mm throtle body long tube headers full exhaust about a month ago my car started acting up it wouldn't start it would turn the engine then stop then turn the engine then stop so I replace the ignition switch and the starter and it crank up fine for about 2 weeks now is doing it again I've replace the ignition switch again but didn't make a difference this time and now I can't hear the fuel pump prime but I can hear it when I turn the key all the way to the rum position and hold it in have the replaced the theft deterrent relay fuel pump relay ignition switch relay checked all fuses still wont start the only way I can get it started and keep it running is to jump the red and purple wire on the theft deterrent relay and jumy the fuel pump relay any help would be really appreciated
Last edited by 99vete; Oct 17, 2020 at 08:04 AM.
Le Mans Master
Joined: Jul 2010
Posts: 6,012
Likes: 726
I have a 1999 c5 corvette 6sp convertible ms4 cam ram air intake manifold 92mm throtle body long tube headers full exhaust about a month ago my car started acting up it wouldn't start it would turn the engine then stop then turn the engine then stop so I replace the ignition switch and the starter and it crank up fine for about 2 weeks now is doing it again I've replace the ignition switch again but didn't make a difference this time and now I can't hear the fuel pump prime but I can hear it when I turn the key all the way to the rum position and hold it in have the replaced the theft deterrent relay fuel pump relay ignition switch relay checked all fuses still wont start the only way I can get it started and keep it running is to jump the red and purple wire on the theft deterrent relay and jumy the fuel pump relay any help would be really appreciated
Last edited by helga203; Oct 17, 2020 at 09:39 AM.
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
I have a 1999 c5 corvette 6sp convertible ms4 cam ram air intake manifold 92mm throtle body long tube headers full exhaust about a month ago my car started acting up it wouldn't start it would turn the engine then stop then turn the engine then stop so I replace the ignition switch and the starter and it crank up fine for about 2 weeks now is doing it again I've replace the ignition switch again but didn't make a difference this time and now I can't hear the fuel pump prime but I can hear it when I turn the key all the way to the rum position and hold it in have the replaced the theft deterrent relay fuel pump relay ignition switch relay checked all fuses still wont start the only way I can get it started and keep it running is to jump the red and purple wire on the theft deterrent relay and jumy the fuel pump relay any help would be really appreciated
anti theft fuel deterrent ( take apart your center console inspect wires to fuel door orange and black if I recall ...2nd option there’s wires for the fuel injection pump positive and ground on the back driver side might be a pain to get at not sure since I relocated mine during the intake install...a improper ground and mis connection had cause my car not to engage fuel pump a few times sorting out where I wanted my relocate them ...If my memory serves me right they should be on a bracket mounted grounded if it’s stock ....black white /black I think
Thread Starter
4th Gear
Joined: May 2020
Posts: 4
Likes: 0
From: Statesville
Yea I hear the relays click I'm pretty sure I figured it out right above the oil filter there is a ground wire on the block it was loose and corroded I just cleaned it and it fired right up it had it at the shop they were getting ready to tune it and it quit on them so I brought it back home messed with it for 2 days straight until late I started checking the ground wires thanks for all the input hopefully that's it and I can get it tuned now thanks a lot to all of yall
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
What size injectors and map sensors do U have
Might save u a few hundred bucks if ur running something and it’s advisable to street tune hahahahaha.......let her idle smooth it ...small grandpa and grand ma drive it no real throttle smooth it , idle that smooth it ,,,,start doing to light 1st gear 2nd gear smooth that and so on always returning back to idle to just watch what it’s doing and then 3rd & 4th 5th sprints ,then after that smoothing let it loose is 1-4th even 5th if u got room smooth that then start smoothing the rpm in gear as it’s toning down costing and u get that bop bop bop lol just saying goodluck
Might save u a few hundred bucks if ur running something and it’s advisable to street tune hahahahaha.......let her idle smooth it ...small grandpa and grand ma drive it no real throttle smooth it , idle that smooth it ,,,,start doing to light 1st gear 2nd gear smooth that and so on always returning back to idle to just watch what it’s doing and then 3rd & 4th 5th sprints ,then after that smoothing let it loose is 1-4th even 5th if u got room smooth that then start smoothing the rpm in gear as it’s toning down costing and u get that bop bop bop lol just saying goodluck
Last edited by Speedy007; Oct 17, 2020 at 01:40 PM.
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Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
If u had a 2 bar and some 60’s u woulda been golden
I have something that was tuned for a vara lol but it’s all on a stock manifold and Tb prob would run the same on yours but not be fully dialed in ...
Last edited by Speedy007; Oct 17, 2020 at 01:42 PM.
Le Mans Master
Joined: Jul 2010
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Just curious why he would need a 2bar?? He's n/a But if he wants mine i'll give it to him. Its just sitting around since im 3bar
Last edited by helga203; Oct 17, 2020 at 01:45 PM.
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
Regardless if he wanted help anything beyond a stock 1.5 bar I’m not a dutche bag and I help fellow vette owner....his car wouldn’t really start on a 2 bar file .....
Last edited by Speedy007; Oct 17, 2020 at 02:45 PM.
Melting Slicks
Joined: Mar 2018
Posts: 2,502
Likes: 187
From: California
I want a picture and part of ur 3bar and it best not be the chines knock off that I have still laying around ......I would like to see that gm part please