ZUKIWORLD Online | Suzuki 4x4 Editorial and Forum
ZUKIWORLD Discussion Forum => Suzuki 4x4 Forum => Topic started by: DirtDevil on September 02, 2009, 10:15:58 AM
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Just picked up a 94 4 door 16V auto.. trying to figure out the issue its having.. it seems to start and idle just fine.. but it rev's extremely slow and lacks power untill about 4500 rpm.. it seemed like the cat was plugged so i unbolted that.. it was fine.. checked timing, it was good too.. compression is good.. airfilter clean.. plugs good... any idea's? im thinking the timing belt may have jumped a tooth ?
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oh and also its not flashing any codes.. just 12
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replace the fuel filter Trev
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yep thats what ive narrowed it down to today i think... did a bunch of sensor testing.. took off the timing belt cover all was good.. time to toss in a new fuel filter.. cap rotor and plugs and it "should" run great
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changed the fuel filter today.. along with cap rotor and plugs ... still no change.. so i checked even more sensors and found nothing wrong.. all with in spec ( intake are temp, MAF, coolent temp, 02 ect.. ) so now the only thing left i can think would be maybe bad injectors or low fuel pressure... and if all that looks good, maybe bad gas??? ??? or even the comp
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hmm still no luck.... tryed seafoam today... made a big cloud of smoke.. thats bout it.. i also ordered a fuel pressure tester any one have any more idea's?? it makes good power from 4500 up and revs normally.. below that it revs very slow.. and if you mat it off idle it strugles and doesnt rev up
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Have you checked the timing? One other thought came to mind, did you run it with the cat out or just look at it? I had one that the muffler collapsed internally and restricted the exhaust causing problems.
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yea i checked the timing.. pulled the cover off to look at the belt and make sure its all lined up... each plug is firing doesnt seem to miss a beat on the timing light.. i ran it with open exaust.. didnt make a difference.. im starting to think it might have a weak fuel pump, i ordered a fuel pressure tester at lordco should be here on tuesday.. but if i pinch off the return that comes off the regulator it doesnt seem to make a difference how it runs
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When you mat it from idle, does it belch black smoke?(rich condition)
What about dizzy timing? You say you put a timing light on it, should be about 8 degrees. Sounds to me like its way retarded, timing wise. Just my guess.
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hmm so it finally flashed me some codes.. one for the TPS and one for the MAF... so i cleared the codes and tryed again.. TPS came up.. but no MAF... i put the ohm meter on both sensors .. the MAF reads just fine.. but i cant seem to get the TPS to adjust to where it needs to be set ... my fuel pressure tester finally came in so ill be checking that tomorrow.. i also ordered a TPS today to concidering it was alot cheaper then i thought it would be ($60)
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TPS problem would be my guess.
Fuel pressure is not likely the problem. If it was a fuel pressure issue, I would suspect it would run better on the lower end, than on the top end.....less fuel needed at low RPM than at higher RPM.
16Vs are usually spec'd at 5* for timing.
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replaced the TPS , checked fuel pressure, and volume.. and still cant figure out the problem... also pulled the valve cover off to see if maybe theres a stuck valve but they all look normal.. im running out of idea's... starting to think maybe the computer is bad?
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Did you change the spark plug wires? I have seen a bad one make it run crappy while accelerating.
What was the timing set at, when you checked it?
Could be a bad ECM. Only way to know for sure is to swap in a known good one.
Did you adjust/check the valves, to make sure they are set correctly?
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my thought is that they are slow until upper rpm range anyways usually a motor that is slow to build rpm is a bit tired in my opinion
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this things still got me stumped... im almost tempted to take it to a shop and let them deal with it... and that would be a first ever for me! ??? ::)
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If you would answer some of the questions we have asked you, maybe we could help you further troubleshoot it. ::)
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Try a compression test on each cylinder before you bring it in. I put a head gasket in a 95 tracker 1.6 16v this weekend. Got it all back together will not fire for nothing. Not even a backfire if I put the timing 180 off. spark good, compression good, fuel good, timing checked over 100 times by the book. No luck loaded it on the trailer going to the bone yard this week. Need any parts cheap?
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Try a compression test on each cylinder before you bring it in. I put a head gasket in a 95 tracker 1.6 16v this weekend. Got it all back together will not fire for nothing. Not even a backfire if I put the timing 180 off. spark good, compression good, fuel good, timing checked over 100 times by the book. No luck loaded it on the trailer going to the bone yard this week. Need any parts cheap?
where are you located?
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Central Wisconsin. 40 minutes east of the twin Cities.
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Central Wisconsin. 40 minutes east of the twin Cities.
Hmm. Little too far for me....otherwise, I might be interested in the whole thing. I still might PM you about a part or two. When are you scrapping it?
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Did you change the spark plug wires? I have seen a bad one make it run crappy while accelerating.
What was the timing set at, when you checked it?
Could be a bad ECM. Only way to know for sure is to swap in a known good one.
Did you adjust/check the valves, to make sure they are set correctly?
plug wires are new.. havent found an ecm to try out yet.. valves are all adjusted correctly...
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Did you change the spark plug wires? I have seen a bad one make it run crappy while accelerating.
What was the timing set at, when you checked it?
Could be a bad ECM. Only way to know for sure is to swap in a known good one.
Did you adjust/check the valves, to make sure they are set correctly?
plug wires are new.. havent found an ecm to try out yet.. valves are all adjusted correctly...
What was the timing set at?
Have you verified the timing is advancing? Don't short the pins in the plug by the battery, shoot the timing light at the mark on the crank pulley and start revving the engine slowly and see that the timing mark moves like it should.
When you put the new TPS in, I guess you cleared the check engine light, right? If so, has it come back on?
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This might be a long shot here but have you checked the return line pressure ?
I know a TBI will act that way if the return line is restricted ..
Basically what happens is as the engine reves , more fuel is dumped but because of the restriction , internal pressure is raised . Basically causing a loss in power and slow climb on the RPM range
Maybe on of the other folks here to tell you what the return line pressure should be for a TPI .
I know with a TBI it should be zero .
If its not all kinds of odd things happen ranging from rich mix , O2 codes , galloping
Might be worth a look
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i set the timing to the spec in the book ( cant remember i did that a couple weeks ago )... any way the problem seems to be developing worse.. now it will not rev up past 800 rpm's atall all of a suddent.... tryed using propain to find a vaccum leak.. no luck.. pulled a vaccum line and sprayed in some ether and she came to life right away... so its must be lean...
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This might be a long shot here but have you checked the return line pressure ?
I know a TBI will act that way if the return line is restricted ..
Basically what happens is as the engine reves , more fuel is dumped but because of the restriction , internal pressure is raised . Basically causing a loss in power and slow climb on the RPM range
Maybe on of the other folks here to tell you what the return line pressure should be for a TPI .
I know with a TBI it should be zero .
If its not all kinds of odd things happen ranging from rich mix , O2 codes , galloping
Might be worth a look
yea ill check that out too... never thought of that... i know the fuel pressure is a little on the high side of things.. no by much though
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I would check the MAF and/or crankshaft pulley key ( have seen the key way get worn ) -
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I need the dash mounted dash dimmer switch! Thanks
Kjmac