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01-07-2007, 07:31 PM | #76 | ||
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Re: Suburban miss fires after going up a hill?
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02-05-2007, 01:15 PM | #77 | |
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Re: Suburban miss fires after going up a hill?
i have 97 tahoe 5.7,havin a problem goin up hill, feels like im losin power,petal to the floor ,but still,no power,does anyone know of problem
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04-02-2007, 11:37 AM | #78 | |
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Re:miss fires after going up a hill & pulling trailer
Hello all I have a 1998 GMC 1500 truck with the 5.7L engine. It has about 85,000 miles on it. I first noticed the misfire problem after we bought a travel trailer and pulled it up a pass to go camping. The light came on and it was a random misfire under load. I started with the tune up, plugs, wires, cap, roter. And I had an injection cleaning and new fuel filter. Well the problem was still there and it started doing it without the trailer at the top of a long hill we live on. Just as I would get to the top and start to let off the gas it would start shaking really bad but it would go away after taping the gas a few times.(not enought to make the light come on) Right before a camping trip last fall it did it again with the trailer on a slight incline on the freeway. We turned around and headed back to the shop. They thought maybe they would try the EGR valve and that did the trick! We pulled over a 5000 foot pass both ways and not a problem. Well a month ago (4 mo. after the EGR) it started missing again!!! So then I tried the seafoam in the pcv line but I'm not sure it got to all the cylinders? The pcv enters on the side of the intake so I'm not sure if its one big cavity under there or not. I also put the seafoam in the gas and I will put some in the oil today. The seafoam in the intake didn't do the trick so I might try the egr again, but I'm not sure why the egr would work for 4 months and then start missing again ? Poor quality EGR ?? I can't afford a new truck but this misfire thing is really pissing me off!! It takes the fun out of camping because I worry the whole time if we'll make it there. I did put a K&N filter in last year and I thought I read someone posted about it could foul up the Mass airflow sensor?? I just don't know what to do.
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05-01-2007, 09:49 PM | #79 | |
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Re: Suburban miss fires after going up a hill?
I have a 99 chevy k1500 truck it was doing the same thing on misfiring going uphill or under a load. We changed everything Injectors, wire, plugs.sensor..etc. over 2000.00 worth of parts STILL NOT FIXED.
I changed the fuel cap with a factory one perfect now!!!! 10.00 FUEL CAP Make sure factory though. Thought I would share my fix. Lisa |
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05-10-2007, 08:25 PM | #80 | |
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Re: Suburban miss fires after going up a hill?
I'm having similar problems but for some reason the plug in cylinder four keeps fouling out. About every two weeks it will start to idle rough and the check engine light comes on after each cleaning. Any ideas as to why this keeps happening?
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07-01-2007, 07:21 PM | #81 | |
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Re: Suburban miss fires after going up a hill?
Same problem, misfiring, 5.7 vortec, 140k miles. Just installed NEW heads (old ones cracked), polished rough edges in heads, cleaned piston tops like new, NEW fuel injection with electronic injectors, plugs, wires, distributor cap, rotor (all Delco or better, no crap), new thrust bushing in distributor, new crank sensor. no codes, cam retard ok, ran with GM Tech 2 scanner, everything normal. Popping is now WORSE with everything in great shape. disconnected EGR, no help. Can't drive over 60 without serious popping/misfire. Ran on ignition scanner..trace on primary side was perfect. Fuel pressure 55+ lbs. Replaced new injector system with old poppet valve injection unit..no difference. Really frustrated. Cam sensor in distributor just tells brain which cycle crank sensor is reading..at 2500 rpm shouldn't make much difference in injector pattern. TPS? Looked ok on Tech2. O2's were banging away. Short/long term fuel trim were ok. Cleaned Mass airflow sensor, no vacuum leaks, no slop in timing chain, distributor gear like new.
Frustrated as hell. It really feels like ignition problem, but nothing apparent. It's a small block Chebby..ain't new stuff. Someone out there MUST have figgered this out..talk to me! |
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07-01-2007, 07:30 PM | #82 | |
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Re: Suburban miss fires after going up a hill?
Just read the fuel cap post again..I have disconnected the evap cannister and run it,,no help. There IS a breather on the top of the cannister..pulled up the plactic cover and cleaned the leaves out. No difference. The evap pipe goes across the motor and is connected to the purge valve on the passenger side of the upper manifold. It then breathes into a pipe that sticks up under the throttle body. BTW, cleaned the throttle body and IAC passage. No help.
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07-08-2007, 05:43 PM | #83 | |
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Re: Suburban miss fires after going up a hill?
I don't have time to read all the replys to see if this was solved. I had same problem with 99 5.7 vortec in Van. After a year of looking for a solution to no avail, I went to dealer and they diagnosed as worn distributor shaft bushing or distributor shaft gear can't remember which. That fixed it. It was not the tranny, fuel injectors, tune up, wires, torque converter,intake manifold gasket etc. that was suspected by other mechanics. Hope this helps someone because it drove me crazy. Dale
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08-21-2007, 06:34 PM | #84 | |
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Re: Suburban miss fires after going up a hill?
Hello all ,I had the same problem you all do , first I replaced the cap ,rotor ,pluges ,platinum # 2 plugs ,coil and ignition module , still no good. Then I ran into a old mechanic and he told me to put Sea Foam in my gas tank and in my oil to. Advance Auto sell's it $6.97 a can . Well I did it and 2 tank fulls later no more miss fires , it;s the motor that is gumed up from the gas . BigNed
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08-27-2007, 10:51 PM | #85 | |
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Re: Suburban miss fires after going up a hill?
I have come to believe that this is a sensor induced problem. It could be ice forming in the intake, seeded by carbon (soot) bits. Spraying or adding cleaner to the fuel/induction system seems to fix it.
I don't think its sticking valves or some mechanical gremlin. It can be a bad sensor by itself but trying cleaner is cheap and a quick fix if it works. |
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08-31-2007, 09:33 PM | #86 | ||
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Re: Suburban miss fires after going up a hill?
Quote:
Just returned from a trip through the Ozarks and Appalachians, misfire problem is as bad as ever, and I wasn't towing anything. Seems as long as I keep it in 3rd and under 65mph, the problem goes away. I have high hopes for the SeaFoam, because if that doesn't do the trick the next step is tearing into the intake and heads...... I still want to know why this problem seems to affect the '99s. What changed? |
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10-03-2007, 06:34 PM | #87 | |
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Re: Suburban miss fires after going up a hill?
I replaced my Crank sensor, problem solved.
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10-10-2007, 02:12 PM | #88 | |
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Re: Suburban miss fires after going up a hill?
99 suburban here and same problem! 128,000 miles
Started doing this a couple of years ago when pulling the boat but got so it would missfire without pulling the boat but only when going up a hill. Premium fuel helped reduce the problem. My mechanic cleaned the popet valves last week and my family took it on a road trip this weekend running regular unleaded. No missfires, no shakes but I am getting a knocking (rattling) sound when accelerating. I don't know whats going on but its back to the mechanic. $$$$.$$ Anyone ever come up with a solution to this? My mechanic and I suspect the problem is carbon buildup. |
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10-14-2007, 01:18 PM | #89 | |
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Re: Suburban miss fires after going up a hill?
P0305 code on a 99 suburban.
I have the same problem with my Suburban. SVS Engine soon goes on when going on a uphill. Changed all plugs and wires. I was told to change the coil by another mechanic. Can you tll me with your experiences what did you do to fix the problem. Truck is well maintained but running out of ideas. I reside in Escondido. Please email me if you have an idea or remedy to the problem I am having. It would be greatly appreciate it. Thanks... |
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10-14-2007, 03:16 PM | #90 | |
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Re: Suburban miss fires after going up a hill?
Welcome to AF, this also can be caused by carbon deposits on the valve stems causing the valves to hang up in the guides, GM has a TSB on this issue covering your year I believe, the problem is pinpointing this as the issue, a top engine decarbonizing treatment is performed and if the condition clears up this indicates that is the problem, but this is a temp. repair, the heads would have to come off.
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