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09-15-2013, 09:26 PM | #1 |
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6.0 wont rev past 1200rpm
Took my first spin in my LS swapped 58 swb and the motor is unresponsive after 1200 rpm. It doesnt die it just acts like its hitting a rev limiter. Any thoughts what is causing this issue?
Its a 2003 lq9 6.0 with a PSI stand alone harness Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
09-16-2013, 12:24 AM | #2 |
meowMEOWmeowMEOW
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Re: 6.0 wont rev past 1200rpm
Is it throwing a fault code, any other symptoms etc?
Is it dbw? How was it tuned?
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09-16-2013, 07:18 AM | #3 | |
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Re: 6.0 wont rev past 1200rpm
Quote:
Yes, its a dbw It's a mail order tune, not sure how it was tuned. Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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09-16-2013, 08:38 AM | #4 |
1965 Chevy C10, 2005 4.8L/4l60
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Re: 6.0 wont rev past 1200rpm
sounds like limp mode to me.
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09-16-2013, 10:49 AM | #5 |
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Re: 6.0 wont rev past 1200rpm
Do you have a fuel pressure gauge you can put on it? Low fuel pressure will do what you are saying....
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09-16-2013, 10:54 AM | #6 | |
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Re: 6.0 wont rev past 1200rpm
Quote:
If the fuel pressure was to low , wouldnt that affect the idle, as well as the rpms below 1200? Posted via Mobile Device
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09-16-2013, 11:31 AM | #7 |
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Re: 6.0 wont rev past 1200rpm
No, not necessarily. I had the hose between the pump and sender get a hole blown through it a while back and the car would start and idle fine, but when you went to take off it would fall on it's face, it was running on 15psi!!!
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09-16-2013, 01:12 PM | #8 |
meowMEOWmeowMEOW
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Re: 6.0 wont rev past 1200rpm
Does it rev in nuetral, or is the 1200rpm limit at all times?
Could be a DBW/TAC problem, but those usually cut off ALL response at the pedal , not just above a certain point.
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09-16-2013, 02:14 PM | #9 | |
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Re: 6.0 wont rev past 1200rpm
Quote:
I dont have a tach hooked up Im guessing on the 1200 rpm thing , but its definitely not far off from that. Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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09-16-2013, 01:27 PM | #10 |
*** That's interesting ***
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Re: 6.0 wont rev past 1200rpm
I couldn't imagine doing a LS swap without a code scanner (and a real-time parameter monitor). It is the first tool to use when strange things like this start to happen. Get one. You WILL need it.........
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Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
09-16-2013, 02:15 PM | #11 | |
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Re: 6.0 wont rev past 1200rpm
Quote:
Can you recommend one to get? Posted via Mobile Device
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09-16-2013, 03:29 PM | #12 |
meowMEOWmeowMEOW
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Re: 6.0 wont rev past 1200rpm
At minimum the $15 thing from Harbor Frieght will tell you whats the basic CEL's are.
I bought a ScanGuage to use in my trucks dash, it reads most codes and as a bonus it displays the engine parameters as a functional gauge I use while driving.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
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09-16-2013, 03:52 PM | #13 |
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Re: 6.0 wont rev past 1200rpm
You could use the torque app and check codes on your phone a long with parameter monitoring, all you need is a 15$ bluetooth obd2 connector
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09-16-2013, 07:16 PM | #14 |
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Re: 6.0 wont rev past 1200rpm
Ok, good and bad news.
Its not throwing any codes and the dbw stuff is operating correctly. I was able to rev it pretty high as long as I push the gas pedal slow, and I mean extremely slow. When I do this though it is sputtering and running extremely rough. After about 4000 rpm it falls on its face, if I can even get it to rev that high without falling on its face. If I push the gas pedal fast at all ,forget about it. All this without throwing a single code. Im stumped. Could it be as simple as bad spark plugs, the motor sat for about a year? Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
09-16-2013, 07:43 PM | #15 |
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Re: 6.0 wont rev past 1200rpm
Injectors are probably stopped up
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09-16-2013, 07:44 PM | #16 |
meowMEOWmeowMEOW
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Re: 6.0 wont rev past 1200rpm
Clogged injectors, I swear we just had another member have an issue and after new o-rings and soaking the injectors, his truck ran fine.
Could also be the fuel pump is dying, there is a restriction in the line, the filter is effed, your not calling for (or getting) full fuel pressure. I say all fuel stuff because bad plugs and coils trigger Misfire Detection codes pretty easily unless the counter has been set really really high.
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09-16-2013, 08:24 PM | #17 |
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Re: 6.0 wont rev past 1200rpm
How do I unclog the injectors?
Posted via Mobile Device
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09-16-2013, 08:25 PM | #18 |
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Re: 6.0 wont rev past 1200rpm
The fuel pump and filter and tank are brand new.
Posted via Mobile Device
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09-17-2013, 08:23 AM | #19 |
1965 Chevy C10, 2005 4.8L/4l60
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Re: 6.0 wont rev past 1200rpm
I believe you have to soak the injectors in sea foam and then you need to figure a way to have them fire outside of the truck to get the tar and stuff out of it. I knwo I have read it before but I cant remember it all.
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09-17-2013, 08:36 PM | #20 |
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Re: 6.0 wont rev past 1200rpm
I think I got it figured out, the fuel pump relay isnt working properly.
Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
09-17-2013, 10:12 PM | #21 |
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Re: 6.0 wont rev past 1200rpm
besides soaking the injectors.....you can fire an injector with a 9v battery. Hook a spray can cleaner to the fuel inlet side and fuel the injector with a 9v battery connectors leads and some alligator clips.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
09-18-2013, 10:19 AM | #22 |
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Re: 6.0 wont rev past 1200rpm
i just went thru cleaning all my injectors.... pretty easy.... and i am glad i did it..
i used PB blaster in a syringe, a small rubber hose to connect the syringe with the injector. short pigtail from a spare harness, i used a regular full size car battery.. i just touched the wire to post and pulled it away to make the injector fire.... i hope this helps..
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09-18-2013, 10:50 AM | #23 |
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Re: 6.0 wont rev past 1200rpm
look at that my dad is educated on all the fuel injection stuff now...get it Faribran...you know more than me...
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Just sold my C10...sad day... Looking for a 1972 Blazer to hopefully fill the hole in my heart. |
09-18-2013, 10:58 AM | #24 |
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Re: 6.0 wont rev past 1200rpm
Naah bud.. i learn every day from you..
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09-18-2013, 10:43 PM | #25 |
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Re: 6.0 wont rev past 1200rpm
It was the fuel pump relay , it wasnt sending constant power to the pump, it was sending an intermittent signal. Which was dropping the fuel pressure down to 10psi when I pushed the gas pedal. The interesting part is that the motor was running on 35psi, didnt figure it would do that.
Posted via Mobile Device
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'58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5 |
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