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car jerks severely at 3000+ rpm
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lightbulb
Novice
Jul 14, 2019, 4:55 AM
Post #1 of 17
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car jerks severely at 3000+ rpm
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People,
1987 Sunbird GT non turbo, when cold engine, and accelerating, the car jerks back/forth, struggling at about 3000 -4000 rpm's. manual transmission. But after say, 5 minutes, as it warms up, problem goes away. Recent cylinder head replaced, but leaking oil at camshaft carrier, and blue smoke coming out of tail pipe. Head gasket blew with coolant spewing everywhere, before head gasket replacement.
I dont think the oil burning should be the cause, do you? Maybe head gasket was not put on right and coolant is seeping into cylinders when car is shut off, sits overnight, and upon startup car runs rough because of coolant mixing with fuel(?). But shouldnt that be spit out immediately, and not for 5 minutes?
I checked the OHMS on both temp sensor and air temp sensor inside air filter housing, both checked out OK.
Thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 14, 2019, 5:29 AM
Post #2 of 17
(1002 views)
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Re: car jerks severely at 3000+ rpm
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IDK at the age and new head properly done? For now just check spark plugs for evidence of anything. All should look the same bet one or two look different? Coolant if just a little bit would take a little time to burn away but doesn't fire would boil out.
Next just because is check back pressure for restricted cat conv. would clog usually a smooth loss of power at first but would check,
T
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lightbulb
Novice
Jul 14, 2019, 7:15 AM
Post #3 of 17
(990 views)
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Re: car jerks severely at 3000+ rpm
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IDK at the age and new head properly done? For now just check spark plugs for evidence of anything. All should look the same bet one or two look different? Coolant if just a little bit would take a little time to burn away but doesn't fire would boil out.
Next just because is check back pressure for restricted cat conv. would clog usually a smooth loss of power at first but would check,
T
Thanks, T. I should mention that the head was entirely machined at a shop- valves, etc. I do have to do it all, over again, though. Then maybe go from there.
I just drained the oil and got no coolant residue in it. Thats a good thing. If coolant is not drained in oil pan, does that necessarily mean that it is not seeping into the cylinders?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 14, 2019, 8:02 AM
Post #5 of 17
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Re: car jerks severely at 3000+ rpm
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Yup: If heavily machined IDK the list of maybe issue but can find them. It's totally possible to have this as a useful car probably best for more local use only now but still can be fine - depends on how horrible something is that you MAY find.
IMO, not collectible but an OK working set of wheels a chance to save vs tons newer thing more costly. For me used parts would be hopeless now the last place is closed that kept a clean old something if of any interest for dinky stuff - miss that.
You've made this investment whatever that cost worth giving some checks and thing a look and try.
Same as Hammer said, no coolant in oil only means that not that it's right. It can burn it, leak unseen onto hot items you'll see a drop in coolant and or evidence on plugs decide what you wish to do or have done,
T
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lightbulb
Novice
Jul 14, 2019, 8:28 AM
Post #6 of 17
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Re: car jerks severely at 3000+ rpm
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Thanks, people. Good to know. Still, glad none is making its way down to the engine/oil pan. I can easily redo the head gasket. Got little to lose. I have plenty of time, and heck, gives me something to do. It's a 2nd car. Drive to work every day.
Update: did compression test- dry got 175 psi each cylinder, then added a teaspoon of oil and got 195. Is this normal ? Does it mean my rings are probably OK? If so, why am I getting burning blue smoke out tail pipe?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 14, 2019, 9:38 AM
Post #7 of 17
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Re: car jerks severely at 3000+ rpm
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Compression a little high if even close lower end and valves should be I good shape. The jerking can be weak wiring, coil or coil packs and more. If this isn't all rusted out you can chase that down as a second car it's a wild savings and a gamble.
Used anything is a gamble at least you aren't at the high roller games with this. New is so costly doesn't solve it for many in no time it's used too, :-)
Tom
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 14, 2019, 12:31 PM
Post #9 of 17
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Re: car jerks severely at 3000+ rpm
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Hmmm? Trick if dark is either a spark tester ground one end and other go near coil and wires it can flash. AYOR spray very slightly salted water over coil pack (engine cool/cold) conducts electricity of spark voltages will show might stall it out. At least you see right where it shouldn't. Can refresh it with WD-40 or other stuff called "wire dryer" still.
When out you'll see carbon tracing of the fault if really there sometimes not but know it's wrong.
Again - plugs should all look the same if one different go looking for why,
T
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 14, 2019, 3:14 PM
Post #11 of 17
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Re: car jerks severely at 3000+ rpm
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I actually use blue window cleaner but IDK what you have or what tap water or other. Distilled does not conduct any electricity, sodium/chloride (salt) water does. Not tons just pollute it a bit and just a mist/damp don't drown things :-)
T
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lightbulb
Novice
Jul 15, 2019, 3:13 PM
Post #13 of 17
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Re: car jerks severely at 3000+ rpm
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No sparks at all. So this morning, opened up distributor and found one connector to ignition module with no insulation! Even they were not touching (3 tiny slip connectors) something must have been going on with the 3 uninsulated terminals. I removed distributor, and on bench I removed each one, and wrapped in elec tape. Drove it cold engine and problem disappeared!! I figured it out!!
ya just gotta keep at it. Now I just have to figure out how to stop the seepage under camshaft carrier where it meets the head. Ever try that stop leak for motor oil?
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lightbulb
Novice
Jul 15, 2019, 4:22 PM
Post #15 of 17
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Re: car jerks severely at 3000+ rpm
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Now I just have to figure out how to stop the seepage under camshaft carrier where it meets the head. Ever try that stop leak for motor oil? No, definitely no stop leak. Sounds like you are just talking about a valve cover gasket. It's no big deal. less than an hour to change.
No, where camshaft carrier meets cylinder head. Just one spot, 1/2" wide, seeepage.
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Hammer Time
Ultimate Carjunky
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Jul 15, 2019, 4:40 PM
Post #16 of 17
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Re: car jerks severely at 3000+ rpm
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There is no solution without taking the housing off. It appears it uses silicone and not a gasket to seal that.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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