Thread: no injector pulse?

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  1. #1 no injector pulse? 
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    All I did was disconnect the battery and took off plug wires to remove the tunkside exhaust to weld up a leaking header and weld a wideband bung in the down pipe. I also replaced the map sensor. With a new one. It cranks and I have fuel pressure. I also checked and verified spark on two random wires. I also noticed that while cranking the temp guage peggs which it never has before. I have fuel pressure but no wet fuel on plugs. I hooked up hptuners and scanned as I cranked it over and nothing reading on the injector duty or either injb1 or injb2. Looks like the injectors ain't firing.


    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  2. #2 Re: no injector pulse? 
    Moderator dsmuts's Avatar
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    Swap the other map back into it and see what happens
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: no injector pulse? 
    SE Level Member Monday's Avatar
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    You won't pulse when cranking. You only pulse before cranking when the pump primes. Then once it starts injectors resume.
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  4. #4 Re: no injector pulse? 
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    Quote Originally Posted by dsmuts View Post
    Swap the other map back into it and see what happens
    The other map is nfg, I broke the vacuum port before nd I glued it to get by till I got the new one.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  5. #5 Re: no injector pulse? 
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    Quote Originally Posted by Monday View Post
    You won't pulse when cranking. You only pulse before cranking when the pump primes. Then once it starts injectors resume.
    Ok wrong choice of words then, basically I'm getting no fuel from the injectors. I have power to both injector wires.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  6. #6 Re: no injector pulse? 
    Moderator dsmuts's Avatar
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    Try starting with starting fluid?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  7. #7 Re: no injector pulse? 
    Turbo is the way to go. BillBoost37's Avatar
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    Yeah.. I thought you meant not injector pulsing to give you fuel. The way it works is the pcm on key on, primes the fuel pump and pulse the injectors quick to prime the cylinder for start up. Injectors are then not pulsed again until start up or a little throttle.

    The ignition supplies voltage to the injectors and they stay hot as long as the ignition is on. The pcm grounds the injector as it sees fit.
    I drink..so consider that when reading my posts.

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  8. #8 Re: no injector pulse? 
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    Quote Originally Posted by BillBoost37 View Post
    Yeah.. I thought you meant not injector pulsing to give you fuel. The way it works is the pcm on key on, primes the fuel pump and pulse the injectors quick to prime the cylinder for start up. Injectors are then not pulsed again until start up or a little throttle.

    The ignition supplies voltage to the injectors and they stay hot as long as the ignition is on. The pcm grounds the injector as it sees fit.

    Yeah my injectors ain't giving me fuel. I will have to re check but I think there was voltage to both wires even while cranking.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  9. #9 Re: no injector pulse? 
    GTP Level Member indygrandprix's Avatar
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    do what dsmuts said and try using a little starting fluid. this will verify a fuel issue
    Quote Originally Posted by BillBoost37 View Post
    I went NA when a whore left -$300 in my bank account.
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  10. #10 Re: no injector pulse? 
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    Welli found the problem, it's the new map sensor, I unplugged the new one and plugged it into the old one but left the vacuum line connected to the new one. It took a few cranks but it fired up. I left it running and plugged it back into the new sensor and it stayed the same. If I shut it off and restart it in the new, it won't start. This is the sensor I bought.
    http://www.ebay.com/itm/231...id=p3984.m1439.l2649

    Andy suggestions as to why the new one don't work?

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  11. #11 Re: no injector pulse? 
    GT Level Member Seachicken's Avatar
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    hook up a vacuum pump to the map and watch what it does on a scanner, probly a bum sensor.

    On standard's website they list the as4 for vin 1,

    ship it back on warranty?
    06 Gxp, Bermuda Blue
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  12. #12 Re: no injector pulse? 
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    Quote Originally Posted by Seachicken View Post
    hook up a vacuum pump to the map and watch what it does on a scanner, probly a bum sensor.

    On standard's website they list the as4 for vin 1,

    ship it back on warranty?
    I'm not sure if I'm a vin 1 as I have a donor motor in the fiero. For the vacuum thingy, does the vehicle have to be running or just KOEO? I've contacted the seller, waiting a response. I have put in a 2 bar that I had ordered for another project but though it was wrong as the idle was surging, turns out I didn't let it learn. Now that same sensor idles fine. What should the map numbers be with the engine running?

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  13. #13 Re: no injector pulse? 
    Moderator dsmuts's Avatar
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    hmm who could have called that? lol
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  14. #14 Re: no injector pulse? 
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    Quote Originally Posted by dsmuts View Post
    hmm who could have called that? lol
    Yess sir but you only get a cookie as you only got a half answer. You never explained why. Lol

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  15. #15 Re: no injector pulse? 
    Turbo is the way to go. BillBoost37's Avatar
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    Vin 1 is supercharged.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  16. #16 Re: no injector pulse? 
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    Quote Originally Posted by BillBoost37 View Post
    Vin 1 is supercharged.

    So I take it I did get the correct sensor?

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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  17. #17 Re: no injector pulse? 
    Moderator dsmuts's Avatar
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    Half a cookie is better than no cookie
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  18. #18 Re: no injector pulse? 
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    The company is sending a replacement, so we'el see.

    86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers
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