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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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I cannot rid my car of the high RPM sputtering. Short of putting in a new engine I am at a loss. It pulls strong up to 4,000 RPM. After that it sputters and jerks. If I "feather" the gas I can get to redline. If anyone is in northern Indiana and wants to stop by and give it a shot come on over. If not, I will limp around under 4,000 until I can afford a C4.
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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Registered
Join Date: Jan 2002
Location: West Lafayette Indiana
Posts: 1,421
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Where are you at, I'm in Hammond with relatives in south bend/mishawaka. I have no experience with cis but I'll look back at your threads and see if anything jumps out at me
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Dennis H. 72 911E 2.7 RS stuff 72 911T with a 2.7(Sold 5-13-2011) 2012 Kona Blue Metallic Mustang GT Convertible 6spd 67 Mustang coupe future SVRA group 6 car 63 Falcon hardtop 302/4spd |
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,962
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What have you done to troubleshoot? Fuel pump, fuel filter? Air filter clogged? Checked compression... tested fuel injectors?
The CIS system is a good one and its been around that there are very few things that it can do that someone has not been through before... Do not give up, keep moving ahead and finally you will find the problem... Joe
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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I am in Warsaw. I have replaced and fiddled with every doo-dad on the car and taken it to a certified P-car mechanic twice. Same prob.
Quick run-down: Within the last year. fuel pump, filter, injectors, air filter. Cleaned all screens within fuel system. Plugs, plug wires, cap, rotor, points, coil. I have had the CIS tuned as far as fuel mixture and pressure. It was tested and then tweaked after two weeks. I have also ran two tanks of Techron thru the tank. The car runs and starts great everytime. I drive it almost every day. I am the bird flying into the plate glass window. ![]()
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,962
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Shawn,
Replacing injectors is not the same as checking them. You might check the spray pattern on them as there could be a bad line or restriction in your dist head. The problem sure sounds like its in the CIS somewhere. Have you switched any components from other cars? Joe
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,474
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is the mechanical advance frozen? did the "professional" guy make any headway? a volume comparison between all the injectors often shows something. i made this rig years ago, and still use it a lot on problem jobs. pull all the injectors out and hang them in the vials, hoses still attached, then turn on the key and raise the sensor plate arm by hand and compare volumes at different sensor plate heights. you can see the spray pattern too. just one more thing to eliminate on the way to the cure.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 Last edited by john walker's workshop; 08-25-2007 at 08:01 AM.. |
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Registered
Join Date: Jan 2002
Location: West Lafayette Indiana
Posts: 1,421
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Ahh Thrown,
Check your CDI box switch with a known good one if you can. I think a bad box can do what you are experiencing. I had a paermatune that gave similar problems. eventually it sounded like it was running on three cylinders and wouldn't rev at all. I changed the box and presto (well i cleaned the fouled plugs also) it ran correctly.
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Dennis H. 72 911E 2.7 RS stuff 72 911T with a 2.7(Sold 5-13-2011) 2012 Kona Blue Metallic Mustang GT Convertible 6spd 67 Mustang coupe future SVRA group 6 car 63 Falcon hardtop 302/4spd |
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Registered
Join Date: Jan 2002
Location: West Lafayette Indiana
Posts: 1,421
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JW Thats a sweet little set up, I bet the factory would sell you the same thing for a whole lot of money!
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Dennis H. 72 911E 2.7 RS stuff 72 911T with a 2.7(Sold 5-13-2011) 2012 Kona Blue Metallic Mustang GT Convertible 6spd 67 Mustang coupe future SVRA group 6 car 63 Falcon hardtop 302/4spd |
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Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
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Try swapping out the CD unit. I had a similar issue when my Bosch unit went out.
Good luck Hammer! -Brad 80SC |
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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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Anyone close have a swappable CD box?
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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As JW hinted...check the distributor advance. I had problems (seemingly) with my CIS, but it turned out to be a bad advance. For months, I chased CIS problems as all the symptoms seemed to indicate CIS Problem. Everyone I talked to pointed to CIS, but on fellow showed up (joeycatt..thank you!) and poof! Distributor problem.
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,962
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I have an extra CD box out of a 81 car.
Am in Phoenix and flying to Buffalo today... let me know quick... or could send it out Friday. No idea where you live (pls update your profile!) but will be in Orlando next week... Joe 480 699 2339
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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How do you get to the distributer advance? I assume it is under the points?
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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I'm not sure about the 2.7 dist (probably not too different), but on my SC motor I was not able to take the dist apart so for a temporary fix, I cleaned the thing out with carb cleaner spray and then dropped oil into it for lube. It seemed to fix the problem temporarily, until I rebuild it for good. Run a search on distributor...there are a few good threads here.
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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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Joe,
I e-mailed you my address.
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Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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a timing lite will give an indication of dizzy advance...........Ron
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Yep..timing light. Beware, the conditions on your vacuum (retard on the 2.7 I believe, correct Ron?) may be undetectable without load as I discovered with mine. While setting timing in the garage, everything seemed fine, but the test drive yielded poor results. If you do not have correct mech advance, the timing light will likely prove this w/o load, unless of course your vacuum retard is "retarded"
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,226
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Does your car have a catalytic converter or did those things use heat reactors or something. Could it be a clogged exhaust?
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa ![]() |
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,474
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just pop the dist cap and try to turn the rotor by hand. if it turns one way and springs back lightly, it's ok. if it doesn't move, or moves with effort, it needs to be freed up.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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Registered
Join Date: May 2002
Location: Indiana
Posts: 4,553
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Exhaust is new Bursch headers with Bursch 3M muffler. The rotor moves freely and springs back. Does this mean my advance is okay?
__________________
Keeper of the Titanium Monkey 1975 911S (sold) 1973 911 w/3.2 (sold) 1983 911SC targa (sold) Looking for a 987.2 or 981 Cayman |
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